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Alesis DEQ830 User's Manual

1. mode Function Displayed Options Default Value Master Level M LVL 6 dB 0 dB Release Edit Group REL E G Off On On Edit Time Out EDIT Off On Off MIDI Channel MIDI CH All 1 16 ALL MIDI Program Chg PRG CHG Off On On MIDI Out Thru Select MIDI O T Out Thru Thru Sample Rate Select INTCLOCK 44 1 48 48 Force Analog Input INPUT Auto Analog Auto Fast Program Select PRG FAST Off On On Peak Mode PEAK 0 1 2 INF 2 Sys Ex Transmit SND SYX Send N A Note that as you switch from one function to the next the Numerical LED Display will change to show the value of the selected function In each mode you can change the value by turning the VALUE encoder The following pages will describe what each function does Master Level 6 dB The Master Level function is one way to customize the DEQ830 to your environment If the equipment in your setup tends to send very hot signals you can use this function to prevent the output of the DEQ830 from clipping 45 46 Basics of Equalization When hot line level signal comes in the DEQ830 has plenty of headroom to deal with it But if you perform some radical equalization on this signal it is possible that the combination of the incoming hot signal plus the equalization you have done may put the signal over the top and within clipping range The Master Level function allows you to reduce the level of the equalized signal before
2. joued 18 Connections Unpacking and Inspection Your DEQ830 was packed carefully at the factory The shipping carton was designed to protect the unit during transit Please keep this carton in the highly unlikely event that you need to return the DEQ830 for servicing The shipping carton should contain the following items DEQ830 with the same serial number as shown on the shipping carton AC power cable This instruction manual Installing in a Rack The DEQ830 may be simply set on a table or installed in a standard 19 audio equipment rack Thermal Considerations in Rack Mounting The DEQ830 can be mounted an equipment rack occupying one rack space or placed on a table or shelf When you install it keep in mind that heat is the greatest enemy of electronic equipment Please observe the following The DEQ830 is designed to perform properly over a range of ambient temperatures from 10 C to 40 C 50 to 104 in up to 80 non condensing humidity These are not absolute limits but Alesis cannot guarantee that the DEQ830 will meet its published specs or remain reliable if operated outside of these ranges Always allow adequate ventilation behind the DEQ830 Do not seal any enclosure that holds this unit It is not necessary to leave an empty rack space above or below the DEQ830 However if yout environment is unusually warm and not air conditioned space b
3. Once you have created an interesting program you can save it to one of the 100 user program locations Here s how to do this Press the STORE button to enter Store mode 2 Use the VALUE encoder to select the new location for the edited program For your convenience programs 25 99 have been left blank so you can store your editing experiments somewhere without fear of overwriting a program you might want to use latet 3 Press the VALUE encoder to store the program to the new location This will preserve the EQ settings for all eight channels of audio For a detailed explanation of how to use this mode see page 41 At the factory we set all of Program 00 s frequencies to 0 dB It s a good idea to leave Program 00 this way but if you have already overwritten it with some of your own settings you can just create your own program with flat settings for the purposes of this experiment Remember if the red CLIP LED at the top of a Channel Meter lights up that means the signal is clipping To prevent this reduce the level being sent to the proper channel Programs 25 99 have been left blank so you have somewhere to store your programs right away without overwriting the factory presets Quick Start Guide Step 4 Save an EQ Curve In addition to being able to save entire programs you can also save the settings for an individual EQ curve Here s how to do this 1 Select the curve you wish to save by pres
4. become the new home for the edited program For information on how to perform this procedure see page 41 Save Curve mode Pressing the SAVE CURVE button takes you to Save Curve mode This lets you save an edited EQ curve to one of the 100 memory locations in the DEQ830 s curve bank These curves can be recalled later and applied to any channel of any program You can use the Curve Bank to save templates for all possible EQ applications For example you can save an EQ curve that generally 31 32 Basics of Equalization works well for male vocals Say you have two three channels of male vocals feeding into the DEQ830 To EQ these just retrieve the curve from the Curve Bank apply it to each male vocal channel and modify it slightly to fit each particular vocal For information on how to do this see page 41 Retrieve Curve mode This mode allows you to take a stored EQ curve from the Curve Bank and place it into the currently selected channel or Link Group For information on how to do this see page 41 Bypass mode This mode is nearly as simple as it sounds pushing the BYPASS button will let you hear the non equalized audio But there s a bit more to it than that There are also two gain adjustment stages that can be used to compensate for a reduction or increase in signal level caused by the equalization curve being used The value for one of these stages Channel Level is saved along with the EQ settings whe
5. there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help 13 14 This page intentionally left blank Quick Start Guide you can t wait to get started The Alesis DEQ830 is a unique product but its basic hookup and operation are similar to other equalizers in most respects If you re experienced with signal processors this chapter is a shorthand guide for those who want to start using the DEQ830 right away If you have questions about any of the features don t worry all the details will be covered in later chapters Step 1 Hook it up to a mixer 1 Plug the POWER jack the back of the DEQ830 into a grounded AC power source with the supplied power cable 2 Using high quality cables plug the left and right main outputs of a non powered mixer into the Channel 1 and Channel 2 inputs on the back of the DEQ830 You may connect up to eight separate audio
6. It is also possible to select and edit several frequencies at once as you ll see later The VALUE encoder is also used for all sorts of data entry such as selecting programs and curves changing global parameter values and so forth Changes made with the VALUE encoder are reflected in the Numerical LED Display to the left of the knob Numerical LED Display The three digit LED display you see to the left of the VALUE encoder is always showing either a value or an abbreviated name To help you know at a glance what sort of information the display is giving you there are three green LEDs immediately below the Numerical LED Display PROG If this LED is lit this means the value in the display is a program number You will see this when the unit is in Program mode or Store mode CURVE When lit this LED indicates that the number in the display is telling you which curve has been chosen dB This LED tells you that the value in the display pertains to a gain change The only time that none of these LEDs will be lit is when the DEQ830 is in Utility mode Basics of Equalization Description of the Basic Modes Program mode When this manual refers to Program mode we mean the very top level of functionality of the DEQ830 In program mode turning the VALUE encoder will let you select between the 100 user definable preset programs in the unit A program consists of more than just EQ settings The things stored in memory an
7. Put two adjacent frequencies down and the next one up repeating the pattern Try broken teeth i e boosting some frequencies more than others Adjust which frequencies to emphasize de emphasize to suit the incoming audio Settings chart We ve provided the chart on the next page because we know some of you prefer to have a hard copy of your favorite settings And thanks to the digital heart of the DEQ830 you ll always be able to reconstruct the curve exactly as it was using the numbers you write down A few notes about filling out the chart 1 When a value is exact like 8 or 4 place a dot in the appropriate square above the band When the band s value is zero or flat draw a dash through that square instead of a dot This will help you keep track of numbers above and below zero by giving you a visual reference point just as the green LED does on the front panel You ll naturally begin to draw an extended line through consecutive bands when they re all set to zero For intermediate values like 3 5 we suggest writing that number in the square above that band which most closely approximates the actual value Don t forget to record the Channel Level setting Note depending on the incoming audio it may be necessary to reduce the gain on some bands to prevent clipping There are preset curves similar to the ones used in these examples You may find it interesting to compare the way various audio sou
8. WITHOUT REFERENCE TO CONFLICTS OF LAWS This warranty gives you specific legal rights and you may also have other tights required by law which vary from state to state This warranty only applies to products sold to purchasers in the United States of America or Canada The terms of this warranty and any obligations of Alesis under this warranty shall apply only within the country of sale Without limiting the foregoing repairs under this warranty shall be made only by duly authorized Alesis setvice representative in the country of sale For warranty information in all other countries please refer to your local distributor m 67 68 Alesis Contact Information Alesis Distribution LLC Los Angeles CA USA E mail support alesis com Website http www alesis com Alesis DEQ830 Reference Manual Revision A by Randy Lee Yamada and Edwin Erdmann Revision B by Bret Victor Copyright 2003 Alesis Distribution LLC All rights reserved Reproduction in whole or in part is prohibited Specifications subject to change without notice 7 51 0138 C 05 09 2003
9. as to store the program the gain value of those bands will be remembered as 12 dB whichever was the value that was last reached for those bands The limits of Relative Gain There will be times when the Relative Gain display will not go all of the way up or down to a value of 24 This is because the DEQ830 takes into account the gain setting of all of the bands when an Edit Group is formed If the highest gain setting of any band in the Edit Group is 6 dB then from there down to 12 dB is only 18 dB So this is the largest number you will see in the Relative Gain display if you run the relative gain value all the way down see fig 3 and 4 co O um mm 4k 5k 63k Fig 3 Edit Group first selected Fig 4 Lower limit of Relative Gain Display for Edit group from fig 3 4k 5k 63k 000 000000 18 00000 9000000 22 39 40 Basics of Equalization Likewise if the lowest gain setting of any band in this same Edit Group is 4 dB then the largest number you will see in the Relative Gain display going all the way up is 16 see fig 5 22 16 0000000 00 0000000 00000 4k 5k 63k Fig 5 Upper limit of Relative Gain Display for Edit Group from fig 3 So if you run the Relative Gain display up and down repeatedly with this Edit Group the display will hit the ceiling
10. at 16 and bottom out at 18 The Release Edit Group function Once you have changed the value of the Edit Group the DEQ830 will react one of two ways to further presses of the BAND SELECT buttons To decide which option suits your working method or circumstance experiment with the setting for the Release Edit Group function in Utility Mode If this function is on the very next BAND SELECT button you press after you have changed the level of the Edit Group will release all of the previously selected bands The only band that will be selected is the one you just pressed You will know this happened because only Band Gain LED will now be blinking If the Release Edit Group function is set to Off the next BAND SELECT button you press after you have changed the level of the Edit Group will simply add that band to the Edit program be sure to store it in Group memory For instructions on how to do this turn to page For a more detailed explanation of the Release Edit Group 41 function see page 46 Basics of Equalization Basic operation Store mode Once you have created program you would like to save press the STORE button to enter Store mode This will cause the Numerical LED Display to blink with the number of the current program Turning the VALUE encoder allows you to choose program number between 00 99 the destination for your edited program Once you have chosen the location you w
11. est tomb Puisque son fonctionement normale g n re de la chaleur placez cet appareil au moins 15cm des quipments p ripheriques et assurez que l emplacement permet la circulation de Pair Ce produit utilis avec un amplificateur et un casque ou des enceintes est capable de produite des niveaux sonores pouvant engendrer une perte permanente de Ne Putilisez pas pendant longtemps un niveau sonore lev ou un niveau non confortable Si vous remarquez une perte de l ouie ou un bourdonnement dans les oreilles consultez un sp cialiste exposez pas l appareil l goutture ou l claboussement Ne placez pas les objets remplis de liquides vases fleur bo tes de boisson non alcoolique tasses de caf sur l appareil AVERTISSEMENT Pour r duire le risque du feu ou de d charge lectrique n exposez pas cet appateil la pluie ou l humidit Quand ce produit est en fonction l alimentation secteur peut provoquer des interf rences sur la fonction surround Une fois install si vous d tectez que le produit ne fonctionne pas correctement le probl me peut tre r solu en effectuant un reset de l appareil d brancher l alimentation et rebrancher la apr s quelques secondes ou ins rez l alimentation de l appareil dans une prise secteur quip e d une masse correcte Lesen Sie bitte die folgende Sicherheitshinweise German Sicherheit Symbole verwendet in diesem Produkt Dieses Symbol a
12. for the DEQ830 that you may not have considered So we try to write our manuals as carefully as we build our products The goal of this manual is to get you the information you need as quickly as possible with a minimum of hassle We hope we ve achieved that If not please drop us an email and give us your suggestions on how we could improve future editions of this manual We hope your investment will bring you many years of creative enjoyment and help you achieve your goals Sincerely The people of Alesis For more effective service and product update notices please register your DEQ830 online at http www alesis com support warranty htm DEQ830 Key Features 23 24 25 26 Offers the best of digital technology and analog style control graphic display with instant editing of any band or combination of bands plus the ability to store programs 100 user definable programs each of which holds 8 channels of EQ settings 100 user definable curves each of which holds 30 bands of EQ settings 48 KHz sampling rate 24 bit A D A 28 bit internal processing Eight channels of equalization independent or linkable 30 EQ bands per channel spanning 25 Hz 20 KHz in 1 3 octave increments 12 dB boost cut with center detente Constant Q technology for finer control of audio LOCK function for set and forget situations which prevents accidental reprogramming Retrieve Curve mode for audition
13. gain setting for one or two bands Instruments usually sound better when you cut the problem frequencies instead of boosting the frequencies you want to feature 51 Basics of Equalization Constant Q vs Variable Q What makes the 8 unique Early graphic equalizers relied solely on a form of equalization known as Variable DEQ830 on the other hand is what is known as Constant equalizer This method of equalization is a relatively recent development in the history of sound reinforcement and recording technology you will see illustrated in the charts in this section the Constant Q method allows for a higher degree of control over the sound being processed because of its significantly greater accuracy Before we go any further it s time for some definitions Q The range of frequencies affected by a band Variable Q A process in which the range of frequencies affected by a band changes as the amount of gain is cut boosted Constant Q A process in which the range of frequencies affected by a band stays the same as the amount of gain is cut boosted It may help to define these terms visually as well In the following illustration we see the three basic terms that govern the operation of a single band The vertical bar of the graph represents decibels of cut boost and the horizontal bar represents frequency in Hz The dotted line leading to the center of the curve indicates the freq
14. it reaches the final output stage of the DEQ830 Don t confuse this with the Channel Level settings in Edit mode The Channel Level settings are stored with the program and therefore may vary from program to program The Master Level setting is global i e it is always active and will affect every program There is a diagram on page 32 that illustrates the relationship between Channel Level and Master Level To lower or raise the Master Level setting use the VALUE encoder For an explanation of how to use the Channel Level control feature see page 32 Release Edit Group On Off Of all the Utility mode features this is the one that will most affect the way you work with the DEQ830 The Release Edit Ifyou are likely to edit only Group setting determines the behavior of the BAND SELECT one or two bands at a time buttons in Edit mode when constructing a new curve set the Release Edit For the sake of describing this feature let s review some things we ied to On This already know When you press a BAND SELECT button you VA DK dc enter Edit mode If you don t turn the VALUE encoder right m DUE away you can keep pressing BAND SELECT buttons until you have several of them selected simultaneously This is called selecting an Edit Group Once you have selected an Edit Group you can cut or boost the gain of all of the bands in the Edit Group simultaneously they will move up ot down together The Release Edit
15. or program For more on Channel Level mode see page 41 Basics of Equalization Link mode In this mode you can link multiple channels so that their EQ settings are locked together To experiment with this first select a channel with recognizable settings Next press and hold down the LINK button You can then select channels to link to the otiginal channel by pressing their CHANNEL SELECT buttons You will see the Band Gain LEDs for each linked channel change to match the settings of the currently selected channel But don t worry the original settings are still retained in memory more about that later See page 42 for more details on Link mode Utility mode This is the mode you ll enter when you hit the UTILITY button Here you can adjust a number of global settings that determine how the DEQ830 behaves For details on Utility mode turn to page 45 Real Time Analyzer mode In this mode the DEQ830 will display an animated representation of the frequencies found in the audio signal passing through the unit When you press RTA the Band Gain LEDs will begin to rise and fall as the frequencies of the signal peak and dip This mode also allows you to visually compare the audio signal before and after it is processed by the DEQ830 For more on Real Time Analyzer mode see page 43 33 34 Basics of Equalization Basic operation Program mode Program mode is where to be if you want to call up another pr
16. positions of the signals For these situations be sure to connect the ADAT Optical output of the transmitting device to the ADAT Optical input of the DEQ830 Digital Signal In Digital Signal Out In cases where every device in your audio chain has a digital audio input and output the DEQ830 is right at home Simply pass the audio from the transmitting device s ADAT Optical output into the DEQ830 s ADAT Optical input use it to sculpt the signal and then pass the audio on to the next device by connecting the DEQ830 s ADAT Optical output to the ADAT Optical input of the receiving device Operating the DEQ830 in any of the three configurations described above is really no different from using it in a completely analog system For that reason from this point on in the manual we will make no distinction between operating the DEQ830 in the digital or analog domains Digital audio offers a decided advantage over analog audio when passing the signal through multiple devices The various stages of analog circuitry can cause the quality of the signal to deteriorate rapidly however once a signal has been converted to the digital domain it can be carried from device to device with a minimal loss of integrity This is why it is advantageous to pass the signal through the DEQ830 using its ADAT Optical jacks whenever possible Connections About Audio Cables The connections between the DEQ830 and your studio are your mus
17. sources in the same manner 3 Connect another pair of cables to the Channel 1 and Channel 2 outputs of the DEQ830 and plug them into your amplification system or a pair of powered monitors 4 Press the POWER switch on the front of the DEQ830 to power up the unit 5 You may want to link some of the channels together Channels 1 and 2 for example That way you ll hear the changes you make with Channel 1 affect both channels of the stereo signal at once To do so select Channel 1 by pressing its CHANNEL SELECT button Then hold down the LINK button and press Channel 2 s CHANNEL SELECT button at the same time After this any EQ changes you make to Channel 1 will be reflected in Channel 2 You may link up to eight channels together using this method If you re new to signal processing start with the more detailed instructions for hookup and operation found in the next chapter The DEQ830 s power will turn on automatically once its AC cable is plugged in so be sure to press the POWER switch to turn the unit off while you re connecting it to your other equipment When connecting the DEQ830 to other equipment make sure all gear has been turned off Also to protect your speakers be certain your amplifier s are turned all the way down before turning your equipment back on 15 16 Quick Start Guide Step 2 Try some equalization Play some signal into the unit While learning the unit you shoul
18. what about the band that was set to 0 dB originally was it boosted to 24 dB The answer is Yes and no It was in the sense that the DEQ830 keeps track of the proportional values of the bands even if they exceed the 12 dB limit of gain change for a frequency But the audible audio gain is limited to 12 dB The reason the DEQ830 keeps track of the gain relationship between the bands in the Edit Group is simple It s so you can change your mind pull them back down to values within the 12 dB limit and still have them be the same distance apart For example let s say you decided these frequencies have been boosted too much and you cut them by 12 dB At this point the Relative Gain display would read 12 with the first band s Gain LED at 12 dB and the second band s Gain LED at 0 dB as in fig 1 So far you haven t really reduced the gain of the first band because it s still at 12 dB You still want to bring it down a bit so you take both frequencies down another 3 dB So now the Relative Gain display would read 9 with band one s Gain value at 9 dB and band two s Gain value at 3 dB And now you can see that the gain relationship between the two bands was preserved they re still 12 dB apart Basics of Equalization One important note though Proportional Gain Memory is only temporary If you run one or more bands past the 12 dB limit and then you exit Edit mode for any reason such
19. DEQS30O Reference Manual ALESIS This page intentionally left blank 10 20 30 40 50 60 0 70 80 90 100 Table Of Contents un E 3 4 How to Use This Manual OD Important Safety Instructions Important Safety Instructions English Safety symbols used in this product 7 Please follow these precautions when using this product 7 Instructions de S curit Importantes French 9 Symboles utilis s dans produit 9 Veuillez suivre ces pr cautions lors de l utilisation de apparens se ete ee de tetendit RENNES 9 Lesen Sie bitte die folgende Sicherheitshinweise German i recense de p 11 Sicherheit Symbole verwendet in diesem Produkt 11 Folgen Sie bitte diesen Vorkehrungen wenn dieses Produkt verwendet wild bine eere iere ene teilen 11 CE Declaration of Conformity FCC Compliance Statement esse 18 Chapter One Quick Start Guide 15 If you can t wait to get started UN 5 Step 1 Hook it up to a mixer Step 2 Try some equalization Step 3 Store the EE D 16 Step 4 Save an EQ ARR More VREER Me iri DEQS30 Diagramme 18 Chapter Two Connections 19 Unpacking and 2 19 Installing in a Rack ses Thermal Consider
20. Group feature does not affect these things this is always how the DEQ830 operates However once you make an edit the Release Edit Group feature comes into play If it is set to On the very next BAND SELECT button you press will release all of the previously selected bands The only band that will be selected is the one you just pressed You will know this happened because only that band s Gain LED will be blinking If the Release Edit Group feature is set to Off the next BAND SELECT button you press after you have changed the level of the Edit Group will simply add that band to the Edit Group The upside of this is the convenience of being able to boost three frequencies 3 dB for example and then add another frequency to the pile and boost them all another 2 dB without having to reselect the first three The downside is that you will have to deselect all four bands if you want to grab one more frequency and edit it by itself Basics of Equalization There are pros and cons to both ways of working So experiment with this feature and see which way works best for you To enable disable the Release Edit Group feature from this Utility mode page just turn the VALUE encoder Edit Time Out On Off The Edit Time Out function serves as an auto exit feature When it is enabled if you do not change the gain value of any band or Edit Group for 30 seconds the DEQ830 will exit automatically to Program mo
21. air of channel inserts Simply connect one insert cable to the left main insert of the mixer and connect the two mono jacks to the Channel 1 input and output of the DEQ830 Use another insert cable to connect the right main insert to the Channel 2 input and output of the DEQ830 You can also simply connect the balanced main outputs of the mixer to the inputs of the DEQ830 then connect the outputs of the equalizer to the inputs of your mixdown recorder monitor system etc Balanced I O Some recording consoles have separate balanced jacks for the sends and returns instead of a single TRS jack If your recording console has these connections use a balanced TRS cable to connect the insert send to the input of the equalizer and another balanced TRS cable to connect the equalizer output to the insert return Operating Levels The DEQ830 can operate in either a 4dBu or 104 setting rear panel switch allows you to configure the unit to your audio environment If you are unsure about the nominal operating level of the equipment to which you will be connecting the DEQ830 refer to the Reference Manual for that equipment OOOO0000000000000 0000000000000000 Since DEQ830 has eight channels you can connect eight independent sources For example you could use Channel 1 to EQ the rhythm guitar Channel 2 to EQ the bass guitar Ch
22. anceled check or some other positive proof that the product is within the warranty period ALESIS reserves the right to update any unit returned for repair ALESIS reserves the tight to change or improve design of the product at any time without prior notice This warranty does not cover claims for damage due to abuse neglect alteration or attempted repair by unauthorized personnel and is limited to failures arising during normal use that are due to defects in material or workmanship in the product THE ABOVE WARRANTIES ARE IN LIEU OF ANY OTHER WARRANTIES OR REPRESENTATIONS WHETHER EXPRESS OR IMPLIED OR OTHERWISE WITH RESPECT TO THE PRODUCT AND SPECIFICALLY EXCLUDE ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY OR OTHER IMPLIED WARRANTIES Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you IN NO EVENT WILL ALESIS BE LIABLE FOR INCIDENTAL CONSEQUENTIAL INDIRECT OR OTHER DAMAGES RESULTING FROM THE BREACH OF ANY EXPRESS OR IMPLIED WARRANTY INCLUDING AMONG OTHER THINGS DAMAGE TO PROPERTY DAMAGE BASED ON INCONVENIENCE OR ON LOSS OF USE OF THI PRODUCT AND TO THE EXTENT PERMITTED BY LAW DAMAGES FOR PERSONAL INJURY Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you THIS CONTRACT SHALL BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OF CALIFORNIA
23. and and audience are not present effective tool in isolating and eliminating feedback in the main or house system ell 1 Insert the EQ between the mixer s monitor output and the KAE Pu MA monitor amplifier 2 Slowly and carefully raise the monitor level to the point of feedback Notice that it always feeds back at the same frequency unless the mic is moved a lot As soon as you hear feedback turn the monitor level down but not off 3 Select a band that is near where you think the feedback is occurring For example if you re getting high frequency feedback try 6 3 kHz 4 Slowly raise the 6 3 kHz Band Gain level while listening for feedback If you hear feedback cut that frequency because you guessed right 5 If you don t hear feedback return that band to 0 and repeat this procedure with another frequency band Once you hear feedback cut that frequency If you don t hear feedback at any frequency using this method try boosting the monitor level a little more Filtering effects The answering machine popular vocal effect is to filter the voice to a limited frequency range This telephone effect be used any instrument or mix Here s how to get that sound on the DEQ830 1 Press all of the BAND SELECT buttons in the ranges from 25 Hz to 630 Hz and from 6 3 kHz to 20 kHz on the channel you are using Or you can hold down a BAND SELECT button and turn the VALUE encoder to sele
24. ank Basics of Equalization This section will describe how equalization works and explain the functions of the DEQ830 s controls What is equalization An equalizer boosts or cuts a frequency range The DEQ830 is a graphic equalizer which means it has many fixed frequency bands that can be cut or boosted The term graphic is appropriate because the combined settings of the bands often resemble a curve or graph Thus it is often possible to know what the unit is doing to the sound simply by looking at it from a distance The other type of equalizer a parametric equalizer can sweep the frequency bands and adjust the frequency range affected by the cut ot boost of each band Alesis sells a parametric equalizer called the 450 The most basic level of control graphic equalizer is the gain setting for band Each of the bands represents predetermined frequency range and its gain setting controls the amount of boost or cut for that frequency range setting of 0 dB means that the signal will not be affected in the area of those audio frequencies Depending on the program material boosting cutting just one frequency can have significant impact on the sound When all of the frequency bands are taken together the impact can be huge Equalization can be used for Adjusting the timbre of an instrument voice mix or effect Cutting or boosting frequencies to make a source easier to mix wi
25. annels 3 and 4 to EQ the left and right outputs of a keyboard and so on Never place the equalizer between the power amp and the speakers as the high powered levels created by the power amp will damage the DEQS30 Modern production values sometimes lead to the heavy use of compression during the mastering process When processing CD audio you may find it necessary at times to lower the Channel Level of the active program so as to avoid clipping the output stage of the DEQS30 This will allow additional headroom for more extensive equalization See pg 32 for details on the Channel Level function Connecting to the inserts instrument amplifier Unbalanced 1 0 The insert sends on guitar bass amp are usually labeled effects send and return insert send and return This allows your instrument to be boosted to line level before the signal is sent to the equalizer processed and returned to the power amp EQ Out EQ In NET 98 o C 0000000000000000000000000000000 2 00000000 If you using two piece system another method would be to insert the DEQ830 between preamp and the power amp You should never put the equalizer between the power amp and the speaker as the high powered levels created by the power amp will damage the unit Connecting to equipment with XLR inputs and outputs If you are connecting the DEQ830 to a product wi
26. ant press the STORE button again or just press the VALUE encoder This will store the program into the user location you selected Remember if at any time you decide you do not want to save the edited program simply press the PROGRAM button to return to Program mode Your edited program will still be in memory as indicated by the flashing LED above the STORE button The destination program will not have been overwritten Basic operation Save Curve mode Saving an curve is very similar to storing program Once you have created curve you would like to save press the SAVE CURVE button to enter Save Curve mode This will cause the Numerical LED Display to blink the number of the curve you ve been editing Use the VALUE encoder to select a curve number between 00 99 as the destination for the edited curve Once you have chosen the location you want press the SAVE CURVE button again or just press the VALUE encoder This will save the curve s gain settings and Channel Level setting into the location you selected And if at any time you decide you do not want to save the edited curve simply press the PROGRAM button to return to Program mode Your edited curve will still be in memory as indicated by the flashing LED above the STORE button The destination program will not have been overwritten Basic operation Retrieve Curve mode One of the quickest ways to create a program is to select curves
27. ations in Rack Mounting AC Power 70 2 444 404 4 Using DEQ830 in another country Connecting Inputs and Outputs ss 21 Connecting to the Channel or Main Inserts of a mixing Console EEE e niei let eie e ded ee MR rene ee 21 Connecting to the inserts on an instrument 23 Connecting to equipment with XLR inputs and 23 Connecting to equipment with ADAT Optical inputs and QUEUES mnt etenim o ST 23 About Audio 25 Chapter Three Basics of Equalization 27 What is equalization esse 5 Description of the Front Panel Description of the Basic Modes OL Basic operation Program Basic operation Edit mode e 84 Basic operation Store mode 41 Basic operation Save Curve mode 41 Basic operation Retrieve Curve mode 41 Basic operation Channel Level mode 42 Basic operation Link mode 42 Basic operation Real Time Analyzer mode Basic operation Utility mode System Exclusive Transmit Send YS Receiving System Exclusive bulk dumps sss 49 The Hidden Modes Demonstration mode Y 50 C
28. aus Plazieren Sie die Nachrichten die mit Fl ssigkeiten gef llt werden Blumevases Getr nkdosen Kaffeetassen nicht auf den Apparat WARNING um die Gefahr des Feuers oder des elektrischen Schlages zu verringern setzen Sie diesen Apparat nicht Regen oder Feuchtigkeit aus Das Netzteil des Audioger tes kann Interferenzst rungen der Umgebung ausgesetzt sein Sollten nach erfolgter Installation Fehlfunktionen am Ger t auftreten k nnen diese durch ein Zur cksetzen des Ger tes Reset durch einen anderen Aufstellungsortes des Ger tes oder durch den Einsatz eines Spannungsstabilisators behoben werden Declaration of Conformity See our Web site at http www alesis com FCC Compliance Statement This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation NOTE This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However
29. ay need to diverge slightly or significantly Rather than unlinking the channels and starting all over again you can use the Curve Bank to bounce the settings from one channel to another Then you can begin diversifying the settings of the channels to match the needs of the incoming audio To do this select the channel from which you wish to copy and save it in an unused location in the Curve Bank Then simply select the destination channel and retrieve the curve you just stored Basic operation Channel Level mode To enter Channel Level mode just press the CHANNEL LEVEL button while you are in Program mode This allows you to use the VALUE encoder to adjust the level of the currently selected channel or Link Group The DEQ830 will allow each channel to be boosted up to 12 dB or cut to 12 dB If you want another 6 dB of gain for a total of 18 dB you will find that in the Master Level function in Utility mode But remember the settings for Channel Level mode are stored with each program The settings for the Master Level function are not To exit Channel Level mode and return to Program mode press the PROGRAM button Basic operation Link mode The ability to link channels is a very handy feature The most common application is in setting up matching EQ curves for stereo instruments or program material but you may link up to eight channels together if you wish The first thing to do is decide which channels you
30. bit to make it sound the way it does on the radio Usually an engineer will choose to cut some of the woofy low midrange while boosting the high end slap and maybe even some of the lows Here is a setting to try on a close miked kick drum Select all frequencies below 80Hz and boost 3dB Cut 500Hz by 8dB Boost all frequencies above 5kHz by 4dB You may also want to apply some compression and gating with the Alesis CLX 440 Vocal Air A popular effect on vocals is to boost the high frequencies to add air to the vocal This is an especially popular effect on ballads sung by R amp B divas This effect is achieved by boosting the high frequencies Boost 16 kHz by 6dB Boost 20 kHz by 6dB Tape Hiss Removal If a recording has a lot of tape hiss such as one transferred from cassette you can usually get rid of it by dropping the high frequencies a bit Select all frequencies from 8kHz up and cut them by 6dB Adjust the gain of different bands to compromise between keeping the high end of the recording and eliminating tape hiss 57 58 Applications Eliminating Feedback During live performance you may experience feedback if a microphone is placed too close to monitor However this feedback often occurs at one frequency before it happens at others You can ring out the monitor by using EQ to cut the frequency that s feeding back The following is best to try when the This procedure can be an b
31. button 2 Press the VALUE encoder You ll see the LED for that band jump to 12 dB 3 Press the VALUE encoder again The LED for that band will jump to 12 dB 4 Release the BAND SELECT button and the value of that band will be returned to its original setting This only works with one band at a time but you ll find it to be a very helpful feature If you want to keep an edited exit Edit mode press the PROGRAM button This will PUE up Boa store it For instructions on return the DEQ830 to Program mode how to do this turn to page 40 Band Gain Cut Boost Ranges Whether you are cutting or boosting a band gain change happens in 0 5 dB increments As you make the change the Numerical LED Display will show you the magnitude of the gain 0 5 1 0 1 5 2 0 up to 12 0 Because it s not possible to show a minus sign in the LED display for negative gain values you ll see the same sequence as you turn the encoder to the left But if there s any doubt in your mind about which way you re going the Band Gain LED will clue you in As soon as you move 0 5 dB away from 0 the LED for that band will change from green to yellow If you are cutting the frequency you ll see a yellow light below the center line If you are boosting it will be above Since the front panel only has thirteen gain LEDs to represent the 49 possible levels of gain in each band you may not see the LED change when you make small adju
32. ct these frequency ranges 2 Use the VALUE encoder to reduce all of these frequencies until their LEDs are at 12 dB 3 Select all of the unedited frequencies and boost them as high as you can without clipping the signal 4 Besure to toggle the BYPASS button to compare the result with the original Applications Comb filtering You ll understand how this effect process got its name once you see the way it looks when recreated on the DEQ830 This one works especially well with two channels that carry the left and right signals from a stereo audio soutce 1 Starting from the far left of the band spectrum press every other BAND SELECT button and take those bands all the way down to 12 dB Then select the unedited bands and boost them 6 dB When you re done look at the LEDs on the DEQ830 and remember the comb analogy The bands set to 6 dB are the teeth of the comb and those set to 12 dB are the spaces between the teeth For an even more interesting effect unlink the first channel from the channel carrying the other side of the stereo spectrum and create the exact opposite settings In other words take the odd bands on the second channel to 6 dB this time and the even bands to 12 dB Be sure to toggle the BYPASS and LINK status of each channel to get an idea of what is being done to the signal as it passes through the DEQ830 Experiment with different sized teeth and spaces
33. d play CD multitrack source into equalizer Choose song musical passage with fairly consistent level so you can take your time experimenting with the different features 1 Put the mixer s main faders all the way down so you don t distort the unit by sending it too much signal 2 Select program 00 on the DEQ830 This will call up a program with all frequencies set to 0 dB allowing you to hear the changes you make to the audio more easily 3 Begin playing your source material Bring the mixer s main faders up gradually until the Channel Meters for Channels 1 and 2 begin to light up Carefully increase the mixer s output level until the meters green and yellow LEDs are lit most of the time If the red CLIP LEDs at the top of the meters light up at all back the mixer s output level down until they stop lighting up This is important because these red LEDs indicate that the signal is clipping on that channel 4 Press one of the BAND SELECT buttons to select a frequency One of the LEDs above that button will begin to blink 5 Use the VALUE encoder to decrease or increase the chosen frequency If desired select another frequency and repeat this process 6 Press the BYPASS button to hear the signal without the equalization effect Press it again to return to the EQ d signal 7 Repeat steps 3 6 for the other audio sources you have connected to the DEQ830 Step 3 Store the Program
34. d recalled when you select a program The gain settings of all 30 bands for channels 1 8 The Link status of all 8 channels The actual gain settings for all non primary channels in a Link Group These are merely hidden by the Link function The individual Channel Level settings for channels 1 8 If the DEQ830 has been in some other mode pushing the PROGRAM button will return it to Program mode If the LED above the STORE button is flashing that means the program has been edited If you ve made any changes that you would like to keep be sure to save them before switching to another program To learn how to store an edited program turn to page 41 Edit mode While in Program mode pushing one of the BAND SELECT buttons will take you to Edit mode You can tell you are in Edit mode when one or more of the LEDs above the BAND SELECT buttons are blinking The bands with blinking LEDs are the ones that will be boosted or cut when you turn the VALUE encoder After you have edited a frequency or an Edit Group a group of frequencies pushing the PROGRAM button will return you to Program mode If you ve made any changes the LED above the STORE button will be flashing Be certain to save any changes that you would like to keep This is where Store mode comes in Store mode Pressing the STORE button takes you to Store mode From here you can decide which of the 100 program locations will
35. de We have included this feature so the DEQ830 can mold itself as seamlessly as possible into your working style If you prefer not to have the unit continue reminding you it is still in Edit mode by blinking its LEDs vying for your attention as it were with the VU meters on your mixer then Edit Time Out is a feature you will appreciate On the other hand if you prefer to have the DEQ830 remain in Edit mode so you will not lose your chosen Edit Group when the unit returns to Program mode you may want keep the Edit Time Out function off The default setting for this function is Off to enable it turn the VALUE encoder MIDI Channel ALL 1 16 The setting for this function determines which MIDI channel the DEQ830 will use to send and receive program changes The ALL setting means program changes will be received regardless of which channel they are on When ALL is selected program changes will be sent only on channel 1 Use the VALUE encoder to select the desired setting MIDI Program Change On Off This function determines whether the DEQ830 responds to MIDI Program Change messages The default setting for the MIDI Program Change function is On If you want the DEQ830 not to respond to program changes use the VALUE encoder to change it to Off MIDI Out Thru Select Out Thru Sometimes it is necessary to daisy chain MIDI devices so the MIDI data from one unit will be passed through one or more
36. ds flower vases soft drink cans coffee cups on the apparatus WARNING To reduce the risk of fire ot electric shock do not expose this apparatus to rain or moisture unit is an audio device whose power supply may be subject to surrounding electronic interference Once installed if you find that the unit is malfunctioning the problem may be solved by resetting the unit relocating the unit or by installing a line conditioner AN Instructions de S curit Importantes French Symboles utilis s dans ce produit Ce symbole al rte l utilisateur qu il existe des instructions de fonctionnement et de maintenance dans la documentation jointe avec ce produit symbole avertit l utilisateur de la pr sence d une tension non isol e l int rieur de l appareil pouvant engendrer des chocs lectriques h Ce symbole pr vient l utilisateur de la pr sence de tensions sur les raccordements de sorties repr sentant un risque d lectrocution Veuillez suivre ces pr cautions lors de l utilisation de l appareil SCD Lisez ces instructions Gardez ces instructions Tenez compte de tous les avertissements Suivez toutes les instructions N utilisez pas cet allareil proximit de l eau Ne nettoyez qu avec un chiffon humide Il est potentiellement dangereux d utiliser des pulv risateurs ou nettoyants liquides sur cet appareil Installez selon les recommandations du constructeur Ne pa
37. e Relative Gain display This is due to a very powerful aspect of the Relative Gain feature and it will require some careful explanation Here s another example Let s say you have two bands selected The first band is set to 0 dB and the second band is set to 12 dB The Relative Gain display reads 0 If you turn the VALUE encoder to the right you will see that number change from 0 to 12 There s an easy way to create an Edit Group from multiple adjacent bands Just press and hold a BAND SELECT button as you spin the VALUE encoder left or right The farther you spin the encoder the more bands you will select After you release the BAND SELECT button you can use the encoder to adjust the gain of all selected bands at once For maximum preservation of fidelity of the input signal the largest number of bands in a channel should be set to 0 dB For example if you have more than half of your bands set to some cut amount and the majority of those cut frequencies are at 4 dB then select all bands and compensate by 4 dB 37 38 Basics of Equalization see fig 1 on page 38 But it won t stop at 12 it will keep racing upward until it reaches 24 This is because that s how far the band that was set to 12 dB had to travel until it hit the ceiling or 12 dB see fig 2 4k 5k Fig 1 Edit Group boosted 12dB 24 0000008 000000 4k 5k Fig 2 Edit Group boosted 24dB But
38. e relative strengths of the various frequency ranges passing through the DEQ830 For more on this mode see page 43 Channel Select To the right of the POWER button you ll see the CHANNEL SELECT buttons These eight buttons are used for selecting a channel for which the EQ settings will be displayed on the 30 Band Gain LEDs The CHANNEL SELECT buttons are also used for creating Link Groups Monitor Select INPUT OUTPUT This button located immediately above the BYPASS and ALL buttons toggles between INPUT and OUTPUT to determine whether the Channel Meters and RTA display the input or output levels The green LEDs above this button indicate which monitoring method is currently selected Bypass When you press this button a red LED will light immediately above the currently selected channel indicating that this channel is in Bypass mode As long as this LED is lit incoming audio will pass through this channel without being affected by its EQ settings Also if you re on a linked channel when you press the BYPASS button all of the linked channels will bypass at the same time Bypass mode is useful for comparing the equalized signal with For details on the relationship between Master Level and Channel Level see page 32 Bypass mode hides the effect of the EQ and Channel Level controls on the audio However the Master Level function from Utility mode is unaffected by the BYPASS button For more in
39. enden Sie ausschlie lich Wagen St nder oder Tische die speziell f r professionelle Audio und Musikinstrumente geeignet sind Achten Sie immer darauf da die jeweiligen Ger te sicher installiert sind um Sch den und Verletzungen zu vermeiden Wenn Sie einen Rollwagen benutzen achten Sie darauf das dieser nicht umkippt um Verletzungen auszuschlie en Ziehen Sie w hrend eines Gewitters oder wenn Sie das Ger t ber einen l ngeren Zeitraum nicht benutzen den Netzstecher aus der Steckdose Die Wartung sollte nur durch qualifiziertes Fachpersonal erfolgen Die Wartung wird notwendig wenn das Ger t besch digt wurde oder aber das Stromkabel oder der Stecker Gegenst nde oder Fl ssigkeit in das Ger t gelangt sind das Ger t dem Regen oder Feuchtigkeit ausgesetzt war und deshalb nicht mehr normal arbeitet oder heruntergefallen ist Dieses Ger t produziert auch im normalen Betrieb W rme Achten Sie deshalb auf ausreichende L ftung mit mindestens 15 cm Abstand von anderen Ger ten Dieses Produkt kann in Verbindung mit einem Verst rker und Kopfh rern oder Lautsprechern Lautst rkepegel erzeugen die anhaltende Geh rsch den verursachen Betreiben Sie es nicht ber l ngere Zeit mit hoher Lautst rke oder einem Pegel der Ihnen unangenehm is Wenn Sie ein Nachlassen des Geh rs oder ein Klingeln in den Ohren feststellen sollten Sie einen Ohrenarzt aufsuchen Setzen Sie den Apparat nicht Bratenfett oder dem Spritzen
40. et you started using the DEQ830 right away This section presents the essential elements of hooking up the unit and using it for the first time Chapter 2 Connections This section gives detailed instructions for connecting the DEQ830 to a variety of typical audio systems Chapter 3 Basics of Equalization This section describes what an equalizer does and explains the function of each of the controls Chapter 4 Applications Skip to this section for tips on using the DEQ830 a variety of settings You ll also find a blank chart representing the DEQ830 s 30 bands of EQ You can make copies of this chart and use them to keep track of some of your favorite settings Chapter 5 Troubleshooting Near the end of the manual you will find troubleshooting tips and a complete list of the DEQ830 s specifications Helpful tips and advice are highlighted in a shaded box like this The names of specific buttons on DEO830 are printed in a bold font and bracketed e g the BYPASS button When something important appears in the manual an exclamation mark like the one shown at left will appear with some explanatory text This symbol indicates that this information is vital when operating the DEQ830 This page intentionally left blank Important Safety Instructions Important Safety Instructions English Safety symbols used in this product This symbol alerts the user that there are important operating and
41. etween units will help the units run cooler 19 20 Connections AC Power Hookup The DEQ830 has what s known as a switching power supply This means it will detect any standard line voltage from 90 to 230 volts 50 60 Hz and adapt itself to that All you need is the proper AC cable for the country in which you find yourself Just plug the female end of the power cable into the DEQ830 s POWER receptacle and the male end into a good quality noise free AC power source Using the DEQ830 in another country Your DEQ830 was supplied with the correct power cord for your country or local area If you plan to travel with it to another country obtain an Alesis AC power cord compatible with the outlets used in the other country and use it in place of the supplied cord These can be obtained through your Alesis dealer or through the Alesis Parts department Connecting Inputs and Outputs Connecting to the Channel or Main Inserts of a mixing console Unbalanced 1 0 Most mixing consoles have insert jacks near the main outputs and for each channel as well These are typically Tip Ring Sleeve TRS jacks with the send and return on the same jack To use the DEQ830 as an effects insert device you will need an insert cable not included Insert Send To EQ Input Ring J Return Tip Insert Send Sleeve Insert Ground This cable splits the TRS insert jack into two unbalanced mono connectors Usually the tip is
42. f this happens the channel s red CLIP LED will light To avoid this turn down the signal being sent to the DEQ830 Other options include adjusting the Channel Level settings in Edit mode or adjusting the Master Level setting in Utility mode The best option is to try another method of achieving the desired effect cut the highs instead of boosting the low frequencies reduce the lows and highs instead of boosting the midrange etc Noise If you boost the high frequencies enough you may hear noise in your system that was inaudible otherwise If this is objectionable you may want to gate that channel when it isn t being used or automate the console so that channel is muted when that instrument isn t playing Phasing You may hear some phase distortion if you apply a lot of EQ such as boosting 12dB on several bands for example This is just the nature of EQ the more you cut or boost the more phase distortion will occur Try getting the same effect with less EQ try cutting instead of boosting try a different position for the microphone All of these suggestions can help you to achieve the desired effect with minimal phase distortion The potential for artifacts is highly dependent on the audio source material A DEO830 curve that works well for processing one source may clip when processing another source depending on which frequencies are present Making the curve work may be simply a matter of a slight adjustment in the
43. formation about the relationship between Channel Level and Master Level see page 32 Basics of Equalization the original signal so you can decide if you like the edit you made Press the button again to get out of Bypass mode and hear the effect Bypass All ALL This button is located just above the BYPASS button It will toggle the Bypass status of all eight channels at once The first press of the ALL button will cause any unbypassed channels to enter Bypass mode Subsequent presses will toggle the Bypass status of all eight chanels together The red LEDs below each channel meter will light to indicate that the channels are bypassed Link PUSHTO LINK This button is used to link channels together so that their EQ settings are locked together Any edits you make to a band on one channel will also be applied to that same band on all linked channels This is useful for quickly setting up a program without having to make independent adjustments for each channel Store Once you have created a program you would like to keep press this button to enter Store mode From there you can use the VALUE encoder to select one of the 100 memory locations to become the new home for the edited program For more information on this function see page 41 Compare This button will help you if you are editing a program and would like to hear how the program sounded before you edited it Pressing this button will temporarily recall the or
44. from the Curve Bank and copy them one at a time into a channel Link Group To enter Retrieve Curve mode hold one of the CHANNEL SELECT buttons as you turn the VALUE encoder The Curve LED will light to indicate that the Numerical LED Display is now showing curve numbers from the Curve Bank As you scroll through the curves you will see the Band Gain LEDs change to reflect the settings of the curves you are passing over but they will not be loaded into the selected channel until you release the CHANNEL SELECT button This prevents having to listen to the audio through curves you know you don t want As soon as you release the CHANNEL SELECT button the channel will assume the EQ and Channel Level settings for the curve you retrieved As we said earlier you should leave Curve 007 gain settings at 0 so that you may use it for building new curves This probably will save you a lot of time and effort When you enter Save Curve mode Real Time Analyzer mode is disabled You will have to re enter the Real Time Analyzer mode after you exit Save Curve mode Curves will be applied to the channel once you release the CHANNEL SELECT button This allows you to audition the curves visually before changing the audio 41 42 Basics of Equalization Copying settings between channels You can use the Link function while editing to help set up identical cutves on multiple channels But at some point the curves m
45. his setting controls the behavior of the VALUE encoder as you use it to select programs When this function is set to its default value of the current program will change instantly when you turn the VALUE encoder When set to Off turning the encoder will not immediately select a program Instead the display will flash the program numbers as you scroll through them but the program won t actually change until you press the VALUE encoder to confirm the selection This prevents accidental program changes Peak Mode 0 1 2 Inf This function allows you to control the behavior of the Band Gain LEDs while in Real Time Analyzer mode as described on page 44 System Exclusive Transmit Send When on this page pressing the VALUE encoder will cause the DEQ830 to transmit all of its programs and curves over the MIDI Out jack in system exclusive sys ex format This is a great way to back up your settings and the combination of this function and the next makes it easy to configure the DEQ830 for particular applications Once the transmission has begun you will see a brief message of Sending followed by the message Done Basics of Equalization This process is not affected by the setting of the MIDI Out Thru Select function When you instruct the unit to Transmit the sys ex data will be sent whether the MIDI jack is set to Out or Thru Receiving System Exclusive bulk dumps The DEQ830 is alwa
46. ic s lifeline so use only high quality cables These should be low capacitance shielded cables with a stranded not solid internal conductor and a low resistance shield Although quality cables cost more they do make a difference Route cables to the DEQ830 correctly by observing the following precautions Do not bundle audio cables with AC power cords Avoid running audio cables near sources of electromagnetic interference such as transformers monitors computers etc Do not place cables where they can be stepped on Stepping on a cable may not cause immediate damage but it can compress the insulation between the center conductor and shield degrading the cable s performance and reducing the cable s reliability Avoid twisting the cable or having it make sharp right angle turns Never unplug a cable by pulling on the wire itself Always unplug by grasping the body of the plug firmly and pulling directly outward And most importantly keep connectors clean Every few months unplug them and wipe off oxidation with a clean cloth soaked in alcohol or contact cleaner Insert the plugs into the jacks a few times to clean the internal jack contacts Although Alesis does not endorse any specific product chemicals such as Tweek also known as Stabilant and Cramolin when applied to electrical connectors are claimed to improve the electrical contact 25 26 Connections This page intentionally left bl
47. ified by the manufacturer Continued next page 13 15 16 17 18 19 Use only with cart stand bracket or table designed for use with professional audio of music equipment In any installation make sure that injury or damage will not result from cables pulling on the apparatus and its mounting If a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as when the power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped This unit produces heat when operated normally Operate in a well ventilated area with at least six inches of clearance from peripheral equipment This product in combination with an amplifier and headphones or speakers may be capable of producing sound levels that could cause permanent heating loss Do not operate for a long period of time at a high volume level or at a level that is uncomfortable If you experience any hearing loss or ringing in the eats you should consult an audiologist Do not expose the apparatus to dripping or splashing Do not place objects filled with liqui
48. iginal program and pressing it a second time will restore the edited program The green LED above this button will light to indicate that the Band Gain LEDs are now showing the EQ curve as it appeared before your edits Utility If you press UTILITY while you are in Program mode you will enter Utility mode which lets you edit the Master Level MIDI Settings the internal clock rate and other global parameters If you hold down this button at startup as the DEQ830 s splash screen is displayed you will enter Lock mode This mode allows you to lock the front panel buttons For more information on Utility mode see page 50 Save Curve Press SAVE CURVE to save a channel s EQ curve to the DEQ830 s curve bank so that it can be retrieved at a later time We ve provided 100 locations 00 99 in which to save curves Curves 00 49 contain factory presets and curves 50 99 are blank Any of the 100 curves may be modified and saved For more information on saving curves see page 40 When you press COMPARE the stored settings for all eight channels of the current program are temporarily recalled 29 30 Basics of Equalization Program If you want to cancel any action in progress and return to Program mode just press the PROGRAM button Value Encoder VALUE On far right side you ll find knob marked VALUE which is used to edit the gain amount of the frequency you have selected with the BAND SELECT buttons
49. ing and selecting stored EQ curves Individual Channel Level adjustment per program Master Level adjustment LINK button for quick creation of matched EQ curves Ability to bypass any or all channels using BYPASS and BYPASS ALL buttons Configurable editing modes to suit the way you work Ability to copy settings from one channel to another 7 Easy to read 7 segment Numerical LED Display 8 More than 350 Band Gain LEDs making it easy to read EQ curves from a distance Signal Level Clip and Bypass LEDs for each channel 20 21 22 Balanced input output TRS Compact 1 space rackmount profile Real time Analyzer RTA mode for visual feedback of incoming and outgoing audio signals with selectable metering modes ADAT Optical input output auto sensing of incoming digital audio Clock selectable between 44 1k and 48k sampling rates MIDI in out for program changes and sys ex storage 4 dBu 10 dBV operating level switch on rear panel For full operating specifications see page 65 to Use This Manual This manual is divided into the following sections describing the various functions of and applications for the DEQ830 While it s a good idea to read through the entire manual once carefully those having general knowledge about audio equipment should use the table of contents to look up specific functions Chapter 1 Quick Start Guide you re already familiar with equalization this will g
50. ited Warranty ALESIS CORPORATION ALESIS warrants this product to be free of defects in material and workmanship for a period of one 1 year for parts and for a petiod of 5 one 1 year for labor from the date of original retail purchase This warranty is For rds eff ective enforceable only by the original retail purchaser and cannot be transferred or assigned service and product For the most effective service the purchaser should register the purchase on the D ALESIS website at http wwwalesiscom support warrantyhtm date notices lease During the warranty period ALESIS shall at its sole and absolute option either repair register your DE Q 830 or replace free of charge any product that proves to be defective on inspection by online at ALESIS or its authorized service representative In all cases disputes concerning this i warranty shall be resolved as prescribed by law http www alesis com obtain warranty service the purchaser must first call or write ALESIS at the address and telephone number available on the Alesis Website to obtain a Return suppor t warri anty htm Authorization Number and instructions concerning where to return the unit for service All inquiries must be accompanied by a description of the problem authorized returns must be sent to ALESIS or an authorized ALESIS repair facility postage prepaid insured and properly packaged Proof of purchase must be ptesented in the form of a bill of sale c
51. ity mode where you Held peaks may be reset at any time by pressing the can use the VALUE encoder to select between the four different RTA button and holding it settings of the Peak Mode function as shown in the chart below for about a second Displayed Name Description Setting 0 No Hold Peaks are not held 1 1 Second Peaks are held for one second 2 2 Seconds Peaks are held for two seconds Inf Infinite Peaks are held until cleared or until you exit RTA mode If you want to reset the peaks while they are being held press and hold the RTA button for about a second Basics of Equalization Basic operation Utility mode To return to Program mode This is where you will find some of the features that govern the firon way the DEQ830 operates in the other modes They are what you would call global settings that their status is not stored with program No matter which program you call up these settings will not change Press the UTILITY button to access Utility mode Pressing it E a repeatedly will cycle through all of the functions that you may edit abbreviated form of the name in this mode An alternate selection method is to press and hold of each function as shown in UTILITY and turn the VALUE encoder in either direction the Displayed column in the table on this page The following table shows the functions that are available in Utility
52. larmiert den Benutzer da es wichtige Funktionieren und Wartung Anweisungen in der Literatur gibt die diese Ma einheit begleitet Dieses Symbol warnt den Benutzer der nicht isolierten Spannung innerhalb der Ma einheit die gef hrliche elektrische Schl ge verursachen kann h Dieses Symbol warnt den Benutzer dem Ausgabestecker Spannungen enthalten die gef hrlichen elektrischen Schlag verursachen k nnen Folgen Sie bitte diesen Vorkehrungen wenn dieses Produkt verwendet wird 1 Lesen Sie die Hinweise 2 Halten Sie sich an die Anleitung 3 Beachten Sie alle Warnungen 4 Beachten Sie alle Hinweise 5 Bringen Sie das Ger t nie mit Wasser in Ber hrung 6 Verwenden Sie zur Reinigung nur ein weiches Tuch Verwenden Sie keine fl ssigen Reinigungsmittel Dies kann gef hrliche Folgen haben 7 Halten Sie sich beim Aufbau des Ger tes an die Angaben des Herstellers 8 Stellen Sie das Ger t nich in der N he von Heizk rpern Heizungsklappen oder anderen W rmequellen einschlie lich Verst rkern auf 9 Verfehlen Sie nicht den Zweck des grounging Terminals auf dem Netzstecker Dieses Terminal wird f r Ihre Sicherheit zur Verf gung gestellt 10 Verlegen Sie das Netzkabel des Ger tes niemals so da man dar ber stolpern kann oder da es gequetscht wird 11 Benutzen Sie nur das vom Hersteller empfohlene Zubeh r Fortsetzung auf n chster seite 11 12 15 16 17 18 19 Verw
53. maintenance instructions in the literature accompanying this unit AN This symbol warns the user of uninsulated voltage within the unit that can cause dangerous electric shocks 4 This symbol warns the user that output connectors contain voltages that can cause dangerous electrical shock Please follow these precautions when using this product DER SON 10 11 Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a damp cloth Do not spray any liquid cleaner onto the faceplate as this may damage the front panel controls of cause dangerous condition Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety When the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Use only attachments or accessories spec
54. mary channel in a Link Group press and hold the LINK button The Channel Number LED for the primary channel will flash Basic operation Real Time Analyzer mode The DEQ830 is capable of a light show that is even more useful than it is entertaining Real Time Analyzer RTA mode uses the Band Gain LEDs to show you exactly which frequencies are present in the audio signal that is passing through the DEQ830 This is an extremely useful tool that has been a mainstay of serious sound reinforcement engineers for decades To enter RTA mode simply press the RTA button located above the POWER button Immediately the DEQ830 will start giving you visual feedback as to what is going on with the instrument or mix that is being processed RTA mode can show you the frequencies present in the signal either before or after the signal is processed To select which you want to see use the MONITOR SELECT button located above the BYPASS buttons to toggle between Input and Output The green LEDs above the button will indicate what you are seeing If you press a CHANNEL SELECT button while in RTA mode the unit will remain in RTA mode and the Band Gain LEDs will show the audio going through that channel By switching channels while in RTA mode you will get a better picture of what s going on with the mix To exit Real Time Analyzer mode simply tap the RTA button Using the VALUE encoder in RTA mode The response of the VALUE e
55. n more drastically in order for any noticeable reduction of frequencies in its range The corresponding illustration for the Constant Q equalizer speaks for itself 8dB 6dB 4dB 2dB A dA 2dB 6dB Bi 40Hz 200Hz 1kHz 10kHz 20kHz Constant Q Adjacent bands at 3 3 and 3dB We offer this information regarding the differences between Constant Q and Variable Q equalizers not as an attempt to persuade the world to reject Variable Q equalizers out of hand in some applications either would do the job nicely But when a greater degree of control over the program material is needed a Constant Q equalizer like the DEQ830 offers a significant advantage 55 56 Basics of Equalization This page intentionally left blank Applications This section is designed to get you started with the DEQ830 by giving some sample settings These are merely suggested settings experiment and find your own once you begin to hear what the DEQ830 does to your sound In a way it s absurd to suggest EQ settings without knowing what the source sounds like EQ is a tool that s used to change the timbre of a sound and it s impossible to suggest an EQ setting that for example will make all guitars sound better So the goal of this section is to give you some ideas for using EQ on your own tracks General EQ tips Rock Kick Drum A rock and roll kick drum is usually EQ d quite a
56. n the program is stored the value for the other stage Master Level is not So what Bypass mode really is doing is causing the audio to pass by the processing stages that are stored as a part of the program The following diagram shows the relationship between each of the stages in the DEQ830 s signal processing chain Bypass Stored with Program Global Settings DEQ830 Signal Flow and Parameter Storage Channel Level mode When you run a number of different instruments into the DEQ830 each channel may experience drastically different signal levels Channel Level mode can be used to adjust the output of each channel independently This mode is also useful when processing a stereo signal If the combination of the source material and extreme EQ settings is causing the output of the DEQ830 to clip Channel Level mode can be used to adjust the output of two stereo channels simultaneously To do this the two channels must be linked See page 42 for more details on Link mode OUTPUT Curve 00 is a flat curve We recommend that you leave Curve 00 s gain settings at 0 so that you may use it as a clean slate for building new curves from the ground up You ll find a description of Channel Level mode further down on this page For a description of the Master Level function turn to page 44 Unlike the Master Level function in Utility mode the settings for Channel Level mode are stored with each curve
57. ncoder is determined by the state the DEQ830 was in prior to pressing the RTA button It might help to think of RTA mode as a submode for whatever mode the unit was in before you put it into RTA mode If you had selected an Edit Group and then entered RTA mode the Edit Group remains active This is extremely useful as you can see the changes you are making to the sound as you turn the encoder But if you were in Program mode first i e if you had simply been scrolling through programs before you pressed the RTA button then the function of the VALUE encoder at that point was and remains program selection So be careful Turning the VALUE encoder can cause the DEQ830 to exit RTA mode and select another program When you enter Save Curve mode RTA mode is exited When you finish saving the curve you have to re enter RTA mode manually BYPASS and ALL work the same in RTA mode as they do in Program mode When you hit one of these buttons the Bypass status of the channels will change as described on pages 28 and 29 If you were in Program mode when you entered RTA mode turning the VALUE encoder will change the program number and the DEO830 will exit RTA mode If you were in Edit mode when you entered RTA mode the encoder will edit the bands you had selected 43 Basics of Equalization Metering modes The DEQ830 allows you to choose how the Band Gain LEDs will respond in RTA mode This is done in Util
58. nction Default is Off of course This function enables you to choose a particular program as the only one that can be selected once the DEQ830 is powered on After this has been done pressing any button besides the POWER button will cause the Numerical LED Display to show Lo for locked This is handy for environments in which the DEQ830 is used for tuning a room for example or whenever you Before you try this feature don t want someone calling up a different program editing the make sure you re happy current program and or storing a different program on top of the with the program you had one you have created for a particular application selected prior to turning the unit off It will be the It s simple to restore the DEQ830 to full functionality i e program you are stuck with when you turn the unit back on after enabling the Lock feature unlock it Just turn the unit off and power it up in Lock mode again turn the unit on and then hold the UTILITY button Then use the encoder to turn this feature off The next time you power up the DEQ830 it will operate normally Basics of Equalization Equalization Artifacts When you apply a lot of 6dB or more you may hear some consequences on the output Here are a few common side effects to applying a lot of equalization and some ways to avoid them Distortion If you boost too many frequencies too high you will distort the output I
59. nnel levels of quiet program Boost Master Level in Utility mode Reduce input level at source Reduce gain of problem bands within program Reduce channel levels of that program Reduce Master Level in Utility mode Press encoder to confirm program selection or change Program Fast setting in Utility mode Refer to page 48 Unlock DEQ830 in Lock mode Refer to page 50 Unlock DEQ830 in Lock mode Refer to page 50 Set Release Edit Group function to On in Utility mode Change Force Analog Input setting in Utility mode Ditto Troubleshooting Refer All Servicing to Alesis We believe that the DEQ830 is one of the best signal processors that can be made using current technology and should provide years of trouble free use However should problems occur DO NOT attempt to service the unit yourself unless you have training and experience Service on this product should be performed only by qualified technicians NO USER SERVICEABLE PARTS INSIDE Obtaining Repair Service Before contacting Alesis check over all your cable connections and make sure you ve read the manual Customers in the USA and Canada If the problem persists contact Alesis and request the Technical Support department Make sure you have the unit s serial number with you Talk the problem over with one of our technicians if necessary you will be given a return authorization RA number and instructions on how to return the unit All unit
60. ogram if you just want to know the number of the program you ate using The DEQ830 has 100 programs in all Programs 00 24 contain factory presets that you can use as starting points for your own programs You can overwrite any of the 100 programs Navigation in Program mode is a breeze First if you re not in Program mode get there by pressing the PROGRAM button The Numerical LED Display will show you the number of the current program you have to do to call up a new program is turn the VALUE encoder This enables you to quickly reach any program in the unit s memory Basic operation Edit mode If you re not already there exit to Program mode by using the PROGRAM button Then select Program 00 on the DEQ830 by using the VALUE encoder The original factory Program 00 is flat program and its easy to see why it s called that the gain setting for every band is 0 dB Calling up this program is almost the same as pressing the Bypass button in that the audio passing through the unit will not be equalized in any way Of course the difference is that you can edit the program and hear the changes that you make If you don t already know what kind of you re looking for this may be a good place to start Single Band Edit Pressing a BAND SELECT button puts the DEQ830 into Edit mode The Numerical LED Display will now display the gain value in decibels dB of the band you just selected In additi
61. on one of the Band Gain LEDs above that BAND SELECT button will start blinking If the gain value of that band is 0 dB the green LED will blink This means there is no gain change occurring in this frequency range If it is higher or lower than that one of the yellow LEDs will blink This indicates that some amount of cut or boost is happening Use the VALUE encoder to change the gain value of that band Turning the VALUE encoder left will lower the gain value or cut the chosen frequency turning it right will raise the gain value or boost the frequency There is an overall range of 12 dB of gain change available If the program number flashes when you try to select another program this means that the Fast Program Select feature is off and you will need to press the encoder to enfirm the program change For more information see pages 44 and 47 Just as Program 00 is a flat program Curve 00 is a flat curve We strongly recommend that you leave Curve 00 gain settings at 0 so that you may use it as a clean slate for building new curves from the ground up Basics of Equalization Band Solo The DEQ830 has handy feature called Band Solo that allows you to isolate a given frequency while you are editing This can help you determine exactly which band you need to highlight or de emphasize It s simple to do 1 Select a band by pressing and holding its BAND SELECT
62. onstant Q vs Variable Q Chapter Four Applications esse D V General EQ tips Filtering effects 58 Settings chart dre nee de EE OO Chapter Five Troubleshooting 61 Line Conditioners and Protectors 61 Care and Maintenance ccsccccssssscsssscccsssscssssscssssssssssscsssssscssssees OL Troubleshooting Index sena Erler 62 Specifications c ecce ee ee ee ee eee eene se eo eee se sposo ts sesso OD Audio Performance itae eir a ede isi 65 Mechanical ERROR 65 Introduction Welcome Thank you for purchasing the Alesis DEQ830 It is a versatile product and whether it becomes a part of your studio or finds its place in your live setup we know it will serve you well Since 1984 we ve been designing and building creative tools for the audio community We believe in our products because we ve heard the results that creative people like you achieve with them One of the goals of Alesis is to make high quality music technology available to everyone This Reference Manual is an important part of that because in it we try to present the DEQ830 s features in a way that is easy to understand and remember But even beyond explaining each feature and parameter this manual can be a key that unlocks an application
63. other pieces of MIDI gear until it is able to reach the last unit in the chain The DEQ830 will allow you to do that just toggle this function s setting from Out to Thru displayed as thr The setting on this page will not affect whether or not the DEQ830 will send its memory out the MIDI Out jack When that 47 48 Basics of Equalization command is initiated Button 11 the sys ex data will be sent in either case Internal Clock Sample Rate Select 44 1 48 The DEQ830 automatically senses an incoming digital signal through its ADAT Optical input and slaves its internal clock to that whether the rate is 44 1k or 48k But if you need the DEQ830 to serve as an A D converter then it will need to be the master clock for the receiving device You may prefer to record the output of the DEQ830 at either 44 1k or 48k Use the setting of this function to set the internal clock to the desired sample rate Once your choice is confirmed you ll see the Sample Rate LEDs change from one rate to the other Force Analog Input Auto Analog There may be times when you want the DEQ830 to ignore an incoming digital signal This function gives you an solution that is easier than reaching around to the back of the rack and unplugging the cable going into the ADAT Optical input Auto is the default value To force the DEQ830 to listen only to the balanced inputs switch this setting from Auto to Analog Fast Program Select On Off T
64. ound awful because they don t have the headroom to handle the DEO830 s output Get a hard wired adapter or cable from your professional audio dealer or make one yourself from components 23 24 Connections Analog Signal In Digital Signal Out In this configuration the DEQ830 can be used to translate an analog signal to the digital domain A likely scenario would be using the DEQ830 as an analog to digital converter between your submix outputs and an Alesis ADAT In addition to acting as gateway the DEQ830 would allow you to shape the sound and send it to the ADAT digitally without the additional noise that can be added by an analog EQ To use the DEQ830 in this way connect the ADAT Optical output of the DEQ830 to the ADAT Optical input of the receiving device Digital Signal In Analog Signal Out In this setup the DEQ830 also serves as a signal converter making it possible to take the digital submix outputs of an 8 bus mixer apply some EQ and then send the result as an analog signal into a sound system the Alesis ProActive 5 1 Surround Sound System for example or a series of independent onstage monitors If an analog mixer has limited channel EQ capabilities you could run the digital signal from an ADAT into the DEQ830 and from there take it to your mixer s analog inputs This would allow you to take advantage of the DEQ830 s extensive EQ and simply use the mixer for setting the levels and pan
65. pressing different buttons We covered number of modes on the preceding pages here are two more hidden modes Demonstration mode Sometimes it s fun have a lot of little lights flashing from the stage or in the studio The DEQ830 has a special key combination that will activate a fireworks display for the entertainment of your clients audience or children In this mode the DEQ830 automatically cycles through the first 25 programs at a rate of 1 per second To begin the pyrotechnics first make sure you are in Program mode Once you are simultaneously press the UTILITY button and the CHANNEL SELECT button for Channel 6 To help prevent an accidental exit from Demonstration mode only a few controls are active in this mode The MONITOR SELECT BYPASS and BYPASS ALL buttons work the same way they do in Program mode audio is bypassed by default The CHANNEL SELECT buttons can be used to switch channels To exit Demonstration mode press the PROGRAM button Lock mode To access Lock mode first you must turn off the DEQ830 Then turn the unit back on wait until you see the letters DEQ830 in the display and then hold down the UTILITY button After a couple of seconds you will see the word Lock appear in large letters above the BAND SELECT buttons This mode allows you to do one simple thing lock the DEQ830 s controls To do this use the VALUE encoder to select On for the Lock fu
66. rces are affected by somewhat similar curves 59 Applications SJUSURUOT Sumos PAIT 129945 500 OL ASTIE AOL AW AO AS Xr ASPE AST 302 3915601 201 008 059 OOS 00 STE 050 000 091 501 001 08 OS SIE 8 8 Orr ci SAM 13e 580032 60 Troubleshooting Line Conditioners and Protectors Although the DEQ830 is designed to tolerate typical voltage variations in today s world the voltage coming from the AC line may contain spikes or transients These can cause audible noises and they can stress your gear and over time possibly cause a failure There are two main ways to protect against this listed in ascending order of cost and complexity Line spike surge protectors Relatively inexpensive these are designed to protect against strong surges and spikes acting somewhat like fuses in that they need to be replaced if they ve been hit by an extremely strong spike Line filters These generally combine spike surge protection with filters that remove some line noise dimmer hash transients from other appliances etc A good example is the Isobar series from Tripp Lite Care and Maintenance Do not spray cleaning Cleaning solution of any sort onto the front panel of the DEQ830 Disconnect the AC power supply then use a damp cloth to clean If a cleaning becomes the DEQ830 s metal and plastic surfaces For heavy dirt use a nece
67. rted to blink Each additional BAND SELECT button you press adds a band and a blinking LED to the Edit Group But why did the Numerical LED Display change to a zero Because once you have selected an Edit Group you can cut or boost the gain of all of the bands in the Edit Group at once They will move up or down together The zero in the display represents a benchmark for the amount of gain change that happens to the Edit Group The 7 segment LEDs can t display the gain values of each band within the Edit Group all at once so if you raise the overall level of the Edit Group by 2 dB that s the number you will see The function of the display in this case is to tell you the Relative Gain amount For the sake of clarity when this manual describes what is shown in the 7 segment LEDs while changing the overall gain value of the Edit Group we will refer to it as the Relative Gain display Here s an example let s say you have selected the bands at 4k and 5k as your Edit Group The initial gain value for 4k is 2 dB and the gain value for 5k is 2 dB The Relative Gain display at this point will read 0 If you rotate the encoder clockwise through four values the final value of the Relative Gain display will be a 2 The actual gain values for 4k and 5k are now 4 dB and 0 dB respectively which will be indicated by their Band Gain LEDs Proportional Gain Memory It s possible you may see numbers as large as 24 in th
68. s installer proximil de sources de chaleur comme radiateurs cuisini re ou autre appareils don t les amplificateurs produisant de la chaleur Ne pas enlever la prise de terre du cordon secteur Une prise murale avec terre deux broches et une troisi rme reli e la terre Cette derni re est pr sente pour votre s curit Si le cordon secteur ne rentre pas dans la prise de courant demandez un lectricien qualifi de remplacer la prise 10 Evitez de marcher sur le cordon secteur ou de le pincer en particulier au niveau de la prise et aux endroits o il sor de Pappareil 11 N utilisez que des accessoires sp cifi s par le constructeur Suite de la page suivante 10 12 15 16 17 18 19 N utilisez qu avec un stand ou table con us pour l utilisation d audio professionnel ou instruments de musique Dans toute installation veillez de ne rien endommager cause de c bles qui tirent sur des appareils et leur support Debranchez l appareil lors d un orage ou lorsqu il n est pas utilis pendant longtemps Faites r parer par un personnel qualifi Une r paration est n cessaire lorsque l appareil a t endommag de quelque sorte que ce soit par exemple losrque le cordon secteur ou la prise sont endommag s si du liquide coul ou des objets se sont introduits dans l appareil si celui ci a t expos la pluie ou l humidit ne fonctionne pas normalement ou
69. s must be shipped prepaid and COD shipments will not be accepted For prompt service indicate the RA number on the shipping label Units without an RA will not be accepted If you do not have the original packing ship the unit in a sturdy carton with shock absorbing materials such as Styrofoam pellets the kind without CFCs please or bubble pack surrounding the unit Shipping damage caused by inadequate packing is not covered by the Alesis warranty Tape a note to the top of the unit describing the problem including your name and a phone number where Alesis can contact you if necessary as well as instructions on where you want the product returned Alesis will pay for standard one way shipping back to you on any repair covered under the terms of this warranty Next day service is available for a surcharge Field repairs are not authorized during the warranty period and repair attempts by unqualified personnel may invalidate the warranty Customers outside the USA and Canada Contact your local Alesis distributor for any warranty assistance The Alesis Limited Warranty applies only to products sold to users in the USA and Canada Customers outside of the USA and Canada are not covered by this Limited Warranty and may or may not be covered by an independent distributor warranty in the country of sale Do not return products to the factory unless you have been given specific instructions to do so Internet Address Important informa
70. sing that channels CHANNEL SELECT button 2 Press the SAVE CURVE button to enter Save Curve mode Use the VALUE encoder to select the new location for the edited curve For your convenience curves 50 99 have been left blank so you can save your editing experiments somewhere without fear of overwriting a curve you might want to use later 4 Press the VALUE encoder to save the curve to the new location You can retrieve any one of the 100 curves for use in any of the DEQ830 s 100 programs For a detailed explanation on how to use this mode see page 41 17 Quick Start Guide DEQS30 Diagram za Heros EJ o mo S m Ot A L__gyndyno jouueyg L sjndu joeuueyg uno 068093404 leondo 1vav uoyng yur suong pejeg Uonng uong suong JeMog Jepooug Ssedig sq31 1 m pops peg 3j 2090 Qa O0 0000000 0 000000000000000000000000000000 BBB EEEE EEEE ami L pueg 1 JEoueunw SJOJS uong joejes a sq37 19497
71. ssary spray a non abrasive household cleaner such as Formula 409 or recommended cleaning FantastikTM DO NOT SPRAY THE CLEANER DIRECTLY solution onto a cloth first ONTO THE FRONT OF THE UNIT AS IT MAY DESTROY lean a THE LUBRICANTS USED IN THE SWITCHES AND e froni panel CONTROLS Spray onto a cloth and then use the cloth to clean the unit 61 Troubleshooting Troubleshooting Index Symptoms No audio at outputs Weak output signal Clip LED lights often Can t select new program display keeps blinking edit program can t select new program Numerical LED Display keeps flashing Lo Must de select all bands in order to edit a single band Analog input is ignored Digital input is ignored Cause No input audio Bad cables Destination is turned down Input level weak Output level weak Decide which is the case by pressing the Bypass button Input level too high Output level too high Decide which is the case by pressing the Bypass button Program Fast is set to Off DEQS20 is locked DEQS20 is locked Release Edit Group function set to Off Digital signal present at ADAT Optical Input Force Analog Input is set to Analog in Utility mode Solution Test with a known good input Replace the cables Check the connections and the level of the mixer or amp to which the DEQ830 is connected Increase level from soutce into DEQ830 Boost cha
72. stments to the gain The table on the following page shows the amount of change in dB it takes to light each of the Band Gain LEDs 35 36 Basics of Equalization LED Gain Change 1248 11 5 12 0 dB 10 dB 9 5 11 dB 8 dB 7 5 9 0 5 5 7 0 4 dB 3 5 5 0 dB 2dB 0 5 3 0 dB 0 dB 0 dB 2 0 5 3 0 dB 4 dB 3 5 5 0 dB 6 dB 5 5 7 0 dB 8 dB 7 5 9 0 10 dB 9 5 11 dB 12dB 115 120 dB Basics of Equalization Multiple Band Edit Selecting an Edit Group Pressing a BAND SELECT button puts the DEQ830 into Edit mode And until you turn the VALUE encoder to boost or cut the gain you can keep pressing BAND SELECT buttons until you have several of them selected simultaneously This is called selecting an Edit Group An Edit Group can be made up of any number of bands Another way to select an edit group is to hold down a BAND SELECT button and turn the encoder This will allow you to select a range of bands at once The Relative Gain display When you pressed the first BAND SELECT button two things happened the Numerical LED Display changed to show the gain value of that band and one of the corresponding Band Gain LEDs started to blink Then when you pressed the second BAND SELECT button two more things happened the Numerical LED Display changed to show the number 0 and a second Band Gain LED sta
73. th XLR balanced inputs and outputs you will need to convert this signal to a TRS balanced connector Make sure that pin 2 of the XLR connector is connected to the tip of the TRS adapter and pin 3 is connected to the sleeve Connecting to equipment with ADAT Optical inputs and outputs The DEQ8230 has capability of receiving and transmitting its audio signal in the digital domain This is done through a pair of ADAT Optical jacks found on the rear panel The jacks are labeled ADAT Optical In Out Each carries eight channels of audio so all eight of the DEQ830 channels are handled by a single cable in each direction Using the ADAT Optical jacks to connect to an external device such as the Alesis ADAT HD24 is very easy because the DEQ830 will automatically switch over to the ADAT Optical inputs when it senses that a valid digital signal is present There are three ways to connect the DEQ830 with another digital audio device as explained on the next page Connections Effects Send N M X AY Av C o AY W 9 N N o Wy V Y A SAN UE RR CAVO VA X WE VE N NY X RA M ON b N Y 5 Don t use line transformers Many XLR to 1 4 adapters sold at electronics stores are NOT adapters but transformers and very low quality transformers at that Don t use these on the output of the DEQ830 they re unnecessary and generally s
74. th other tracks Compensating for less than ideal recording Compensating for less than ideal control room or auditorium acoustics Creating a filter effect Eliminating buzz noise or hum Equalizers can make your recorded tracks sound polished and professional Chapter 4 will describe some specific settings for various instruments and applications 27 28 Basics of Equalization Description of the Front Panel This section will give you an overview of the front panels features Not all features labeled so you may want to refer to diagram of the DEQ830 on page 18 as you read this section Band Select There are 31 buttons side by side on the left half of the DEQ830 s front panel The first 30 are the BAND SELECT buttons Above each of the BAND SELECT buttons is a number like 25 or 8k These stand for the audio frequencies measured in Hertz Hz which are selected for editing by the BAND SELECT buttons below them The 315 button is the CHANNEL LEVEL button which is explained below Channel Level The CHANNEL LEVEL button is used to set the level of the currently selected channel or Link Group This setting is post EQ and pre Master Level Real Time Analyzer RTA This button will put the DEQ830 into Real Time Analyzer mode in which the unit serves as a visual aid for analyzing the audio signal In this mode the Band Gain LEDs dance to the music displaying th
75. tion and advice is available on our Web site http www alesis com Email may be addressed to Support alesis com 63 64 Troubleshooting This page intentionally left blank Specifications Rear Panel 1 0 switchable Analog Input Connectors 8 balanced 1 4 TRS jacks Output Connectors 8 balanced 1 4 TRS jacks Digital Input Connector 1 ADAT Optical Output Connector 1 ADAT Optical Switch set to 4 Nominal input level 4dBu 15dBFS Maximum input level 19dBu 6 9 Vrms Nominal Output Level 4dBu 15dBFS Maximum Output Level 19dBu 6 9 Vrms Switch set to 10 Nominal input level 10dBV 16dBFS Maximum input level 6dBV 2 0 Vrms Nominal Output Level 10dBV 16dBFS Maximum Output Level 6dBV 2 0 Vrms Input impedance 10kQ Output Impedance 2200 MIDI MIDI Input 1 5 pin female DIN MIDI Output 1 5 pin female DIN Audio Performance Signal To Noise Ratio gt 100dB A Weighted Analog In to Analog Out THD N lt 0 005 Analog In to Analog Out Frequency Response 22 22kHz 0 50dB Analog In to Analog Out Power Consumption 15 Watts Max 100 240 VAC 50 60 Hz Mechanical Size 1 75 H x 19 0 W x 5 D Rack Spaces 1 Space Weight 3 0 Ibs 1 4 kg All measurements done over a 22 Hz 22 kHz range with 1 kHz sine wave at IdBFS input Impedances are measured at I kHz 65 66 This page intentionally left blank Warranty Contact Alesis Lim
76. uency at which this band is set You can see that in this example Q covers a range of frequencies from about 200 Hz to about 5 KHz 12dB 9dB 6dB 3dB OdB 3dB 6dB 9dB 12dB Frequency 40Hz 200Hz 1kHz 10kHz 20kHz In the next illustration the difference between a narrow and a wide Q is seen Basics of Equalization Narrow Q Wide Q gt 40Hz 200Hz 1kHz 10kHz 20kHz Variable Q In the next illustration the wider and more gradual curve represents a lower gain setting for a Variable Q equalizer The narrower and more steep curve represents a higher gain setting at the same frequency 6dB 4dB 2dB OdB Variable O Bandwidth changes The previous illustration has been exaggerated somewhat to make the point but you can see how a lower gain setting also boosts frequencies that overlap to some extent into the regions affected by the next highest and lowest frequency band controls Constant Q In contrast a Constant equalizer has a more consistent range of frequencies under its control throughout its cut boost range as illustrated below 6dB 4dB 298 OdB Constant Q Bandwidth fixed 53 54 Basics of Equalization Multi band application and results So far we have only dealt with cutting boosting single frequency bands The differences between the Constant Q and Variable Q methods become more graphic if you
77. will when adjacent frequency bands are involved In this example three adjacent bands are used They have settings of 6 dB 0 dB and 6 dB respectively 6dB 4dB 2dB OdB 40Hz 200Hz 1kHz 10kHz 20kHz Variable Q Adjacent bands at 6 0 and 6dB You can see how the 0 dB setting on the Variable Q equalizer merely serves to round off the top of the curve in actuality this translates into a boost in the range of frequencies under that band s control You would have to cut the gain on that band significantly to reduce the unintended consequences of boosting the other two frequency ranges The Constant Q equalizer on the other hand has more precise control over each of the frequency bands As you can see in this example the effect on the center band is significantly lower 4dB 2dB OdB 40Hz 200Hz 1kHz 10kHz 20kHz Constant Q Adjacent bands at 6 0 and 6dB Basics of Equalization To further illustrate the differences here is a pair of examples in which three adjacent bands have settings of 3 dB 3 dB and 3 dB respectively 8dB 6dB 4dB 2dB OdB 2dB 448 6dB Ban LL LL LL LL LL LL 40Hz 200Hz 1kHz 10 2 20kHz Variable Adjacent bands at 3 3 and 3dB Remember that at lower gain settings there is an even wider Q for a given frequency band on a Variable Q equalizer The center frequency band needs to be edited eve
78. wired to the Send connector which plugs into one input of the equalizer and the ring is wired to the Return connector which plugs into the corresponding output of the equalizer However the wiring of the insert jacks is different on some recording consoles which means that the input output relationship may be reversed Check your mixer s Reference Manual to be sure or just try it both ways this won t damage the DEQ830 Insert Return From EQ Output Connections When connecting audio cables and or turning power on and off please make sure that your amplifiers are turned down or off to prevent damage to your speakers If your mixer does not have insert jacks available at its main outputs simply connect the main outputs of your non powered mixer to the inputs of the DEQS30 then connect the outputs of the equalizer to the inputs of your mixdown recorder or amplified monitoring system 21 22 Connections Mono connections Channel Insert EQ Out EQ In B HHHH 888 O 00 000000000000000000000000000000 0 000000 emm This example shows how to connect the DEQ830 to mono source You can use this method to connect eight mono sources to the DEQ830 You would need eight insert cables to make all of these connections Stereo connections Use two insert cables to connect the DEQ830 to the main L R bus in the same way you would connect it to a p
79. would like to link and then pick one of them to become the primary channel All other channels that you link to the primary channel are known as non primary channels As soon as they are linked all non primary channels will adopt the EQ curve of the primary channel From that point on when you make an edit on the primary channel an identical edit will be made to the audio passing through the non primary channel as well This includes changes to the Channel Level setting also To make it happen hold down the LINK button and press the CHANNEL SELECT button of the channel s you wish to link to the primary channel You will know the channels are linked when you see more than one channel with a yellow Channel Number LED lit You can now make an edit to any linked channel and it will affect all linked channels To unlink a channel hold LINK while pressing the linked channel s button Note that the primary channel cannot be unlinked from its Link Group Basics of Equalization Remember that a non primary channel is mirroring the settings of the primary channel When you perform an edit on a non primary channel you aren t actually editing that channel you are actually changing the primary channe and the audio for all linked channels will be affected by the edit But whatever settings existed on the non primary channel before it was linked will still be there when you unlink it To find out which channel is the pri
80. ys ready to receive a new bank of programs and curves into its internal memory Once an external device begins sending the proper sys ex data the DEQ830 will display the message Reving short for receiving When the sys ex transmission is complete the DEQ830 will let you know by displaying the message Done While the bank is being received front panel edits and mode changes will be disabled There is one thing you can do during this time though If you change your mind in the middle of the transmission and realize you ve loaded in the wrong bank or worse you forgot to back up the programs and curves first you can interrupt the transmission by pressing the PROGRAM button The display will show the word Aborted and then return to Program mode But you d better act quickly as the whole process takes only about 30 seconds And unfortunately as soon the message Reving is displayed the DEQ830 begins overwriting the Program and Curve Banks If you saw that message you will have lost some data But if you interrupted the transmission you will have managed to save some of the programs and curves Warning Sending a sys ex bank into the DEO830 will overwrite the internal memory Make sure you have backed up internal memory before you load in a new set of programs and curves 49 50 Basics of Equalization The Hidden Modes There couple of sub levels of operation that can be accessed by

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