SoundCraft Spirit Monitor User's Manual
Contents
1. 12 Facilities 12 Input Channel 12 Output Sec d s s ded exe god demo 16 Master Section 18 Using your SPIRIT Monitor Console 20 Initial Set UP 2 453 3x RO RACE aes 20 Applications ca 3 3 d 22 Care of your mixer 23 Gloss ty 4 245354 23 Selectable Options 25 Specifications 26 DIMENSIONS ua 3 9 3 9 43 27 Block 28 Front Panel Layout fold out rear page Page 3 Monitor INTRODUCTION Congratulations on your purchase of a SPIRIT Monitor mixer Owning a Soundcraft console brings you the expertise and support of one of the industry s leading manufacturers and the results of over 17 years experience supporting some of the biggest names in the business Designed by engineers who understand the individual needs of musicians SPIRIT Monitor has been built to the highest standards using quality components and employing auto mated assembly techniques beyond the reach of most manufacturers of compact mixers A rugged steel chassis is combined with moulded side trims to give protection and distinctive appearance Custom moulded controls designed for the best feel and visual clarity complemen2. Soundcraft Soundcraft Electronics Ltd 1991 rights reserved Issue 1 Part No ZZ2727 Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor Soundcraft Electronics Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual No part of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic electrical mechanical optical chemical including photocopying and recording for any purpose without the express written permission of Soundcraft Electronics Ltd It is recommended that all maintenance and service on the product should be carried out by Soundcraft Electronics Ltd or its authorised agents Soundcraft Electronics Ltd cannot accept any liability whatsoever for any loss or damage caused by service maintenance or repair by unauthorised personnel Soundcraft Electronics Ltd Unit 2 Borehamwood Ind Park Rowley Lane Borehamwood Herts WD6 5PZ England Tel 081 207 5050 Fax 081 207 0194 Page2 User Guide Monitor Contents Introduction 2 9 4 Ate 4 Basic Principles of Monitor Mixing 5 Getting Started 8 Connections and Connectors 8 Fault Finding Guide 10 Getting to know your console
3. Any signal on both hot and cold i e noise will not be amplified this is known as common mode rejection CMR Balanced inputs should always have both ve and ve connected or if the source is unbalanced source the signal should connect to ve and the ve pin of the input should be shorted to ground Note many modern audio musical instruments have elec tronically balanced outputs which should not be unbalanced by shorting one wire to ground Always use your inputs bal anced where possible All of the outputs are ground compensated a technique which provides a very effective way of optimising noise immunity without the cost and complexity of balanced outputs These outputs employ ground compensation to cancel out the effects of variation in ground potential between the mixer and other equipment which would otherwise show up as hum If the output is driving a device or amplifier that has an unbalanced input connect the ve cold signal to the ground Polarity You will probably be familiar with the concept of polarity in electrical signals and this is of particular importance to bal anced audio signals Just as a balanced signal is highly effective at cancelling out unwanted interference so two mi crophones picking up the same signal can cancel out or cause serious degradation of the signal if one of the cables has the ve and ve wires reversed This phase reversal can be a real problem when microphones are close together an
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5. is re leased regardless of the Pre Post setting 10 ON The ON switch routes the channel signal to the monitor sends and is positioned PRE FADER to mute all outputs from the re spective channel The associated LED is illuminated when the switch is pressed showing that the channel is active 11 PFL PEAK LED When the PFL switch is pressed the Pre Fade signal is fed to the headphones and wedge output where it replaces the se lected source The PFL ACTIVE LED on the master section illuminates to warn that the wedge phones outputs and the meter are now responding to the PFL selection and the PFL LED on the input channel lights to identify the active channel This is a useful way of listening to any required input signal without interrupting the monitor mixes so that adjustments Page 15 Monitor can be made or problems traced When the PFL switch is released the LED on the channel serves as a PEAK indicator to warn when an excessively high signal level is present in the channel The signal is sampled at two points in the channel PRE INSERT PRE Hi PASS FIL TER and POST EQ The Peak LED will illuminate approximately 4dB before clipping and therefore give warn ing of a possible overload even if the peaks are removed by external equipment plugged into the Insert 12 C HANNEL FADER This linear fader determines the proportion of the channel in the mixes and provides a clear visual in
6. mount Page 18 Monitor or plugged in via a cable BARG RAPH METER A sixteen segment three colour bargraph meter provides vis ual monitoring of WEDGE PFL level Normally the post fade Wedge signal is displayed unless any PFL switch is active in which case the PFL signal is shown The level of the dis played Wedge signal follows the actual Wedge output including the effect of the Dim circuit if active The bargraph may be calibrated by a trimmer accessed via a hole in the panel above the meter Adjustments may be made using a small screwdriver taking care not to damage the trimmer TALKBACK GAIN Sets the level of Talkback microphone signal which may be routed to any Monitor Output ALL TALKBACK Pressing the ALL T B switch dims all monitor outputs and adds the Talkback mic signal also dimming the wedge output to prevent feedback Note that ALL T B is disabled when ALL DIM is pressed ALL DIM Pressing ALL DIM attenuates all outputs except the wedge output This provides an instant remedy for serious feedback while the source of the problem is identified 10 PFL ACTIVE LED The LED illuminates whenever a PFL switch is pressed to show that the Wedge and Phones outputs and the Wedge PFL bargraph are now receiving the PFL signal 11 PFL TRIM The rotary PFL TRIM control provides level adjustment of the PFL signal to allow for differences in operating levels The TRIM control has no ef
7. mounted wedge shaped speaker via a suitable power amplifier The Talkback system allows the monitor engineer to talk back to artists either individually via selected monitor outputs or together using a switch on the master section Creating monitor mixes on stage in close proximity to micro phones demands constant awareness of the problem of acoustic feedback The Dim buttons enable the engineer to in stantly lower the output level on any outputs to avoid this problem while more precise level adjustments are made A mixer is often judged amongst other factors by the amount of Headroom available This is a measure of the reserve avail able to cope with sudden peaks in the input signal without distortion caused by Clipping when the signal becomes so high that it would exceed the power supply rail voltages and is as a result limited This commonly occurs where gain set tings are incorrectly set or where sources are improperly matched to the mixer input If the source signal is too high clipping and distortion results If the signal is too low it be comes masked by the background noise which is present to some degree in all mixers The diagram below illustrates this point 7 Clipped Signal VI Noise If the signal level is too high clipping distortion may occur Signal If the signal level is too low it may be masked by the noise 7 Monito
8. noise at the other Set up individ ual input channel as follows Connect the input required microphone keyboard etc Note Phantom powered mics should be connected before the 48V is switched on SetOutput faders at 0 input faders at 0 channel monitor sends fully anticlockwise off and set power amplifier lev els to about 70 e With a typical performance level signal present press PFL button on the particular channel monitoring the level on the Wedge PFL meter Page 20 Monitor e Adjust the input gain until the meter is just reaching the amber section 0dB at a typical maximum source level This allows sufficient headroom to accommodate peaks and establishes the maximum level for normal operation but see note below Repeat this procedure on other channels as required If you cannot obtain a satisfactory setting e g the gain con trol is right at the extreme low end of the scale on Microphone Input and 48 powering is not required try using the Line Input instead to give an extra 20dB range e Listen carefully for the characteristic sound of feedback If you cannot achieve satisfactory input level setting with out feedback check microphone and speaker placement and repeat the exercise e Build up the required individual monitor mixes by feeding the selected channels to the monitor outputs using the channel monitor send controls The corresponding output faders should be initiall
9. o 6600006000000600600 00000000000006000 o 00000600000600 o o0000 000000000 dn nut 00000060000060000000 o0000000000006060000000 66600006000006600 V PHONES T B MIC Page 22 Monitor CARE OF YOUR MIXER General Precautions balance clipping dB decibel DI direct injection equaliser feedback foldback frequency response Avoid storing or using the mixer in conditions of excessive heat or cold or in positions where it is likely to be subject to vibration dust or moisture Keep the mixer clean using a soft dry brush and an occa sional wipe with a damp cloth or ethyl alcohol Do not use any other solvents which may cause damage to paint or plas tic parts Avoid placing drinks or smoking materials on or near the mixer Sticky drinks and cigarette ash are frequent causes of damage to faders and switches Regular care and inspection will be rewarded by a long life Glossary the relative levels of the left and right channels of a stereo signal the onset of severe distortion in the signal path usually caused by the peak signal voltage being limited by the circuit s power supply voltage a ratio of two voltages or signal levels expressed by the equation dB 20Log10 1 2 Adding the suffix denotes the ratio is relative to 0 775V RMS the practice of conne
10. smooth control The faders provide you with total control of the final sound at your finger tips and like an artist playing an instrument you should listen to your fader movements not look at your hands Your SPIRIT Monitor mixer accepts a wide range of input sig nals via a microphone input for very low level signals or a line input for higher level signals from for instance tape ma chines effects processors etc Page 5 Monitor The mixer is split into two sections The Inputs receive match and process individual source signals and distributes them at precise mix levels to a choice of Monitor Outputs The Mas ter section provides monitoring of the audio signal at many points in the mixer either on headphones or meters and pro vides additional master control of talkback functions The Equaliser controls are the most flexible and potentially destructive feature of the mixer They have a similar effect on the frequency response of the input channel as the tone con trols on a hi fi system but with much greater precision and allow particular characteristics of the input signal to be em phasised or reduced It is very important that you become familiar with the effect each control has on the sound and this is best achieved by spending time listening to the effect of each control on a well known track played through the mixer Phase Reversal enables the operator to reverse the polarity of the signal entering the mixer as
11. CK Pressing the TALKBACK switch routes the engineer s talk back microphone signal to the monitor output at the level set on the T B gain control on the Master section and inde pendent of the output fader level At the same time the local monitor mix is dimmed by approximately 6dB to allow the engineer s voice to be heard over the mix and the Wedge out put also dims to prevent feedback through the talkback mic Note that Talkback is disabled when DIM is pressed DIM Pressing the large DIM switch attenuates the monitor output by 6dB as an immediate way of eliminating feedback while the source of the problem is identified PFL When the PFL switch is pressed the Pre Fade signal is fed to the headphones replacing the normal submix signal The PFL ACTIVE LED on the master section illuminates to warn that the wedge phones outputs and the meter are now re sponding to the PFL selection and the PFL LED on the input channel lights to identify the active channel This is a useful way of listening to any required signal so that adjustments can be made or problems traced BARG RAPH METER A sixteen segment three colour bargraph meter monitors the output signal The meter has a peak response and since it reads the final output signal it will also be affected by the DIM switch and include any talkback signal The bargraph may be calibrated by a trimmer accessed via a hole in the panel above the meter Adjustments may be made using
12. a Page 17 Monitor small screwdriver taking care not to damage the trimmer FADER A linear fader controls the overall level of each output Unity gain is at the top of the travel MASTER SEC D C POWER SOCKET The cable from the power supply connects to the console via this 5 pin SRC connector To the right of the power connec tor is the master switch for 48 Phantom Power to all inputs WEDG E OUTPUT The WEDGE output normally drives the engineer s monitor speaker via a power amplifier and when no PFL switches are pressed this is fed by the submix signal The WEDGE output automatically switches to the PFL signal when any PFL switch is active The WEDGE output always listens to the same source signal as the headphones but is also affected by DIM status and any external connections to the Insert socket WEDG E INSERT This is similar to the Input Channel Inserts and allow external processing equipment to be inserted into the output signal path The 3 pole gauge jacks are by passed except when a plug is inserted PHONES A standard 3 gauge jack for monitoring head phones See the diagram on Page 8 for connection details This output is suitable for headphones with an impedance of 4000 or greater TALKBAC K MIC RO PHONE SOCKET A standard female XLR 3 connector is provided for a low im pedance dynamic talkback microphone on a gooseneck
13. a convenient way of checking for incorrect wiring or problems with microphone placement The Monitor Sends provide a way of routing the input sig nals to a number of outputs to create individual mixes for artists foldback or additional speaker outputs Pre Fade Listen PFL allows you to monitor the signal at many points in the mixer Pressing any PFL switch places the signal at that particular point onto the headphones and the PFL meter to check the quality of the signal or to pin point problems Using PFL will not affect the signals on the moni tor outputs Each input channel and all outputs have an Insert A gauge jack socket which is a break point in the signal path It allows the signal to be taken out of the mixer through an external piece of equipment and then back into the mixer directly after its original exit point The Insert point is normally bypassed by the gauge jack contacts and is only brought into opera tion when a plug is inserted Typical uses would include Effects Processors Limiters additional Equalisers or Delay units The terms PRE and POST are often used in the context of In serts Equalisers and Channel Sends and describe whether that facility is placed before Pre or after Post another par ticular section This is explained further in the detailed description of facilities Page 6 Monitor The Wedge output refers to the engineer s own monitoring output which will typically feed a floor
14. any user if a few ba sic rules are followed Get to know the Block Diagram of your console see back of this manual Getto know what each component in the system is sup posed to do Learn where to look for common trouble spots Page 10 Monitor The Block Diagram is a representative sketch of all the com ponents of the console showing how they connect together and how the signal flows through the system Once you have become familiar with the various component blocks you will find the Block Diagram quite easy to follow and you will have gained a valuable understanding of the internal structure of the console Each Component has a specific function and only by getting to know what each part is supposed to do will you be able to tell if there is a genuine fault Many faults are the result of incorrect connection or control settings which may have been overlooked Basic Troubleshooting is a process of applying logical thought to the signal path through the console and tracking down the problem by elimination Swap input connections to check that the source is really present Check both Mic and Line inputs Eliminate sections of the channel by using the insert point to re route the signal to other inputs that are known to be working Route channels to other outputs to identify problems on particular outputs or the Master section Compare a suspect channel with an adjacent channel which has been
15. cting an electric musical instrument directly t the input of the mixing console rather than to an amplifier and loudspeaker which is covered by a microphone feeding the console a device that allows the boosting or cutting of selected bands of frequencies in the signal path howling sound caused by bringing a microphone too close to a loudspeaker driven from its amplified signal a feed sent back to the artistes via loudspeakers or headphones to enable them to monitor the sounds they are producing the variation in gain of a device with frequency Page 23 sub group headroom highpass filter line level signals peaking PFL pre fade listen rolloff shelving spill talkback transient Monitor an output into which a group of signals can be mixed the available signal range above the nominal level before clipping occurs a filter that rejects low frequencies at a nominal level of 10 to 6dBu usually coming from a low impedance source an equaliser response curve affecting only a band of frequencies i e based on a bandpass response a function that allows the operator to monitor the pre fade signal in a channel independently of the main mix a fall in gain at the extremes of the frequency response an equaliser response affecting all frequencies above or below the break frequency i e a highpass or lowpass derived response acoustic interference from other sources the operator
16. cut action will be centred The LF sections are essentially Swept Low Frequency controls covering a range from 40 to 400Hz and providing much greater flexibility than a conventional LF bass control The MID section with a frequency range from 250Hz to 8kHz is particularly versatile for vocals ena bling particular characteristics of the singer to be lifted or dB LF Sectio 20 0 15 0 10 0 5 0 0 0 5 0 15 0 20 100 1k 10k 20k Frequency Hz dB MID Section 0 20 100 1k 10k 20k Frequency Hz Page 14 Monitor dB HF Section 20 100 1k 10k 20k Frequency Hz suppressed very precisely MO NITOR SENDS These controls route the input channel signal to any one or more Monitor busses and the associated Monitor Outputs al lowing a number of completely different monitor mixes to be created The sends are arranged as two groups of four 1 4 and 5 8 and both groups are normally fed after the channel fader POST FADE and therefore follow any changes in fader level Either group may be reconfigured with the feed before the channel fader PRE FADE by changing internal links and details of this modification will be found under Selectable Op tions on page 25 Any Monitor Sends configured as PRE FADE will be unaffected by the input fader position All sends are muted when the ON switch see 10 below
17. d well placed microphone should not need any appreciable equalisation Input Connections The monitor mixer will often share inputs with a front of house mixer and it is particularly important to ensure that the input connections provide complete isolation between the two consoles to avoid hum problems and possible degradation of the signal The provision of balanced splitter transformers or isolating transformers will ensure a clean signal to both con APPLICATIONS The diagram below shows a typical application of the SPIRIT Monitor as a stage monitor console with inputs shared via a splitter box with the front of house console STAGE MONITORS 24 MICROPHONE SPLITTER C 00000000 66600000 C MULTICORES TO Y HOUSE CONSOLE O MIC INPUTS HHHH kee grad HHHH 222 ENGINEER S o0o000000000000000 WEDGE o 6 0000060000006000
18. d you should therefore take care always to connect pins correctly when wiring audio cables Grounding and Shielding For optimum performance it is vital that all signals are refer enced to a solid noise free earthing point and that all signal cables have their screens connected to ground To avoid earth loops use balanced connections where possible and ensure that all cable screens and other signal earths are connected to ground only at their source and not at both ends Page 9 Monitor Source GROUND COMPENSATED TO BALANCED Input 7 eR 2 Source UNBALANCED TO BALANCED Input GND LINK me Source UNBALANCED TO UNBALANCED Input If ground link absent or mains earth isolated from source ground then connect shield at both ends p Avoid running audio cables or placing audio equipment close to thyristor dimmer units or power cables Noise immunity is improved significantly by the use of low impedance sources such as good quality professional micro phones or the outputs from most modern audio equipment Avoid cheaper high impedance microphones which may suf fer from interference over long cable runs even with well made cables Fault Finding Guide Repairing a sound mixing console requires specialist skills but basic Fault Finding is within the scope of
19. dication of channel level Normal operating position is at the 0 mark providing 10dB of gain above that point if required OUTPUT SECTIONS There are eight Monitor Outputs arranged in pairs Each Output offers identical facilities 1 MONITOR OUTPUTS Each Monitor Output is driven by a ground compensated am plifier and fed to standard male XLR 3 connectors 2 MONITOR INSERTS These allow external processing equipment to be inserted into the monitor signal path The 3 pole A gauge jacks are by passed except when a plug is inserted 3 SUB The SUB control and associated switch and LED feed the monitor output to the engineer s submix which is the normal source for the headphones and wedge outputs The signal is derived before the Talkback and Dim circuitry and the sub mix is therefore unaffected by either of those functions in the Output section The submix feed is enabled when the ON Page 16 Monitor switch is pressed LED illuminated HI PASS FILTER A variable frequency filter is provided covering a range of 20Hz to 200Hz and this is always in circuit This may be found useful to reduce the level of stage driven low frequency feedback or particularly to tailor the output frequency to match more closely the frequency range of smaller wedge monitor speakers which may not be able to tolerate high lev els of LF signal Rotate the control fully anticlockwise when the filter is not required TALKBA
20. ered by your new mixer Page4 Monitor Above all remember that your SPIRIT mixer is designed to extend your creativity The more you explore the controls and the effect they have on the sound output the more you will appreciate the flexibility offered by your SPIRIT Monitor mixer BASIC PRINC IPLES OF MONITOR MIXING There was a time when the P A system and the operator ex isted only to increase the overall volume of the performers so that they could be heard in a large room or above high ambi ent noise levels This just isn t true any more The sound system and the sound engineer have become an integral part of the performance and the artists are heavily dependent on the operator s skill and the quality of the equipment While the quality of the front of house PA mix is of prime impor tance the ability of the artists to deliver the best performance may be directly influenced by the quality of the stage monitor mix Indeed the monitor engineer may be required to pro vide a number of quite different individual monitor mixes often under the most adverse conditions The following introduction to the basics of mixing are in cluded for the benefit of those users who may not have any significant familiarity with sound equipment and who are baffled by the endless jargon used by engineers and artists alike The Mixer As one would expect the main purpose of the mixer is to combine sounds but under precise and
21. fect on the level of PFL signal fed to the Wedge PFL meter 12 SUB TRIM The rotary SUB TRIM control provides level adjustment of the 5 Submix The TRIM is pre insert and pre fader and will therefore affect both the level at the wedge output and Page 19 Monitor the bargraph reading 13 HEADPHONE VOLUME The master volume control for the wedge or PFL signal being fed to the headphone socket 4 14 WEDG E FADER The master fader for the Submix or PFL signals feeding the USING YOUR SPIRIT Monitor CONSOLE Your choice of a SPIRIT Monitor console has provided you with a professional product capable of top quality sound mix ing Good results will however only come through experience and time spent understanding the facilities on your console Rehearsal sessions and live performances must focus on the skill and creativity of the artists which must not be hindered by unfamiliarity and difficulty with the operation of the console It is important to recognise and learn by ex periment the importance of correct choice of inputs microphone placement and control settings particularly with respect to feedback avoidance Suitable initial control positions are shown on the front panel drawing inside the rear cover Initial Set Up The diagram on page 7 demonstrated how the matching of in put gain to the signal source was crucial to avoid distortion at one extreme and excessive
22. n pressed and Micro phone input when released When Line is selected the Gain range is reduced by 20dB see 6 below GAIN CONTROL When the Microphone input is selected this control acts as a SENSITIVITY control covering a 50dB range Channel signal level increases as the control is turned clockwise When the Line input is selected it serves as a GAIN control with the scaling reduced by 20dB from the printed scale A nominal OdB input signal will pass through at unity gain with the knob set at the 20dB position Some audio equipment par ticularly that intended for domestic use operates at a nominal 10dBV level and an increased Gain setting will be required PASS FILTER Pressing this switch inserts a 12dB per octave 100Hz Hi Pass Filter in the signal path immediately after the input amplifier This is particularly useful on live vocals and its use is strongly recommended even on male vocals It can also be used for filtering out noise such as stage rumble Page 13 Monitor dB Filter 4 0 TI 3 0 2 0 1 0 0 0 1 0 2 0 3 0 4 0 20 100 1k 10k 20k Frequency Hz EQUALISER The Equaliser EQ comprises three sections The upper con trol provides H F treble boost and cut of 15dB The lower two pairs of knobs are arranged as a cut boost control lower knob of 15dB and SWEEP frequency control which determines at which frequency the boost
23. nal piece of equipment and then back into the mixer to continue through to the final output The Insert is a 3 pole 1 4 gauge Jack which is normally by passed When a jack plug is inserted the signal path is broken at a point just after the Hi Pass Filter but before the EQ section The signal from the channel appears on the TIP of the plug and is returned on the RING Page 12 Monitor The insert point allows limiters compressors and other signal processing units to be added as required to particular input channels and because it is located PRE noise generated by the external equipment may be reduced by a small amount of H F cut in the Equaliser LINE INPUT The LINE Input is 3 pole gauge jack socket to accept balanced or unbalanced line level sources when the LINE switch 5 is pressed Unlike the low impedance Microphone input this stage presents a high impedance gt 10kQ to in put signal enabling many types of instruments to be plugged straight in without boxes or external preamplifiers PHASE REVERSE O The PHASE REVERSE switch reverses the polarity of the se lected input providing a convenient method of compensating for incorrect wiring or microphone placement In some cir cumstances it may be found that pressing PHASE REVERSE will help with feedback avoidance The switch should nor mally be released when not required LINE SELECT The LINE switch selects Line input whe
24. r GEMNG SIARTED CONNECTIONS AND CONNECTORS Although this may seem a simple subject faulty connectors and cabling are the source of most sound system problems Correctly made cables of the proper type with the right connectors for the job will ensure peak performance from your system with minimum noise pick up The following section will help you to connect SPIRIT Monitor correctly Two different types of audio connectors are used 3 pin XLR and three pole gauge jacks These are used in several configurations as shown in the diagrams below 2 Hot 4ve 3 Cold ve 3 Cold ground sense 2 Hot In phase Balanced Input Ground Compensated Output 3 POLE stereo JACK Send Tip Hot 4ve Left Signal Ring Cold ve Right Signal Screen Sleeve Screen Ground Tip Ring Sleeve Insert Points Line Input Headphones Page 8 Monitor Balanced and Unbalanced All channel inputs are balanced i e there are separate ve hot and ve cold wires for each signal plus a ground The design of the differential input amplifiers is such that in terference picked up on these wires is cancelled out This is because since both wires are in close proximity the same in terference will be picked up on each wire and balanced input amplifiers will only amplify the difference between ve hot and ve cold
25. set up identically Use PFL to monitor the signal in each section Page 11 Monitor GETTING TO KNOW YOUR CONSOLE FACILITIES Refer to the fold out front panel diagram at the rear of this manual which shows the control functions on the SPIRIT Monitor Each facility is described below and is identified by a reference number INPUTCHANNEL MIC ROPHO NE INPUT The Microphone input is via a standard female XLR 3 connec tor and is available when the LINE switch is released It is designed to accept a wide range of balanced or unbalanced low impedance input signals 48V Phantom Power is available on each input microphone socket with an overall ON OFF switch at the right hand side of the console beside the power input socket Transformer coupled dynamic microphones may be used without causing damage even when the 48 power is nected but care must be taken when using unbalanced sources because of the voltage present on pins 2 and 3 of the XLR connector NOTE The microphone should always be plugged in before switching the 48 on or off Also you should be aware that some microphones draw an unusually large current which may overload the power supply resulting in distortion Con sult your microphone supplier for guidance if necessary INSERT The INSERT is a break point in the input channel signal path It allows the signal to be taken out of the mixer through an exter
26. speaking to the artistes or to tape via the auxiliary or group outputs a momentary rise in the signal level Page 24 Monitor Selectable Options The eight channel Monitor Sends are factory set as POST FADE but may be altered to PRE FADE in blocks of four 1 4 and 5 8 by repositioning a link on the Input PCB SC3005 as shown below after removing the PCB from the console INPUT BOARD SC3005 J4 3 POST PRE To change Sends 1 4 to PRE FADE carefully unsolder link J4 using the minimum of heat to avoid the possibility of tracks lifting on the PCB Replace the link in position J3 To change Sends 5 8 to PRE FADE carefully unsolder link J2 using the minimum of heat to avoid the possibility of tracks lifting on the PCB Replace the link in position J1 This operation should only be carried out by competent technicians who possess the necessary soldering skills Page 25 Monitor SPEC IAC ATIONS Typical Figures for a 24 Channel Console Measured RMS 22Hz to 22kHz Bandwidth Microphone Input 128 5dBu max gain 150R OUTPUT NOISE 24 channel console 80dBu channels sends turned down C M R R Measured at 1kHz Microphone Input at maximum gain 80dB Line Input at unity gain 50dB DISTORTION THD measured 1kHz at 20dBu 20Hz to 20kHz Bandwidth Line in to Output 0 006 CROSSTALK Mea
27. sured 1kHz Sine Wave Channel Send attenuation 90dB Channel Fader Attenuation 85dB Channel ON switch isolation 100dB Between any outputs 80dB FREQ UENC Y RESPONSE Any Input to Output 3dB 20Hz Output hi pass filter which is always 14 20kHz in circuit turned fully anticlockwise INPUT amp OUTPUT IMPEDANCES Microphone Input gt 2kQ Line Input gt 10kQ Insert Sends 750 Insert Returns 10 26 Monitor Outputs 750 INPUT amp OUTPUT LEVELS Mic Input Maximum Level 10dBu Line Input Maximum Level 30dBu Any Output Maximum Level 21dBu METERING 16 Segment LED Bargraphs Accuracy Relative to 0dB 1dB Dimensions 1088 ooooooooooooo o ooO 24 ch k ooooooooooooo o 000 m ooooooooooooo o ooO ooooooooooooo 000 o o 000 o OOO o OOO ooooooooooooo o 000 ooooooooooooo o ooO 000 o 000 824 o OOO 16 ch o 000 ooooooooooooo o 000 m o 000 ooooooooooooo o ooO OO oo 005 00 oo OOo6o600 m oo OOo6600 ooOQ Y OTD y SART 82 8 590 5 Page 27
28. t the styling resulting in a truly profes sional stage monitor mixer which is ideal for both touring and fixed installations SPIRIT Monitor is available in 16 and 24 channel frame sizes and is designed to complement the SPIRIT Live range of front of house consoles SPIRIT Monitor incorporates circuit technology identical to that used on some of the most sophisticated Soundcraft con soles The input channels are able to accept a wide range of Microphone and Line level signals from separate input sock ets Every channel features wide range gain control phase reverse switch 3 band Equalisation with swept Mid and LF range plus a Hi Pass Filter 8 Monitor Sends PFL Pre Fade Listen Peak LED and a high quality linear fader Each of the eight Monitor Output sections is provided with a variable high pass filter insert point LED bargraph meter Talkback and Dim switches a variable send to the engineer s wedge and a high quality linear fader The master section comprises controls for PFL monitoring en gineer s wedge LED bargraph meter for Wedge PFL and master Talkback and Dim switches The wedge output is pro vided with an insert point and high quality linear fader SPIRIT Monitor is designed to be as user friendly as possible but a few minutes spent reading through this manual will help you become familiar with the product away from the pressure of a live session and allow you to gain full benefit from the superb performance off
29. y set at the 0 mark Listen care fully for each component in the mix and watch the respective output meter for any hint of overload As more channels are added to the mix the meters may move into the red section Adjust the overall level using the Output Faders if necessary or back off the appropriate channel faders until the level is out of the red segments Note The level of any source signal in the final output is af fected by many factors principally the Gain control Channel Fader and Output Fader You should try to use only as much microphone gain as required to achieve a good balance be tween signals with the faders set as described above If the input gain is set too high the channel fader will need to be pulled down too far in compensation to leave enough travel for successful mixing and there is a greater risk of feedback because small fader movements will have a very significant effect on output level If the gain is set too low you will not find enough gain on the faders to bring the signal up to an adequate level Microphone Placement Careful microphone placement and the choice of a suitable type of microphone for the job is one of the essentials of suc Page 21 Monitor cessful sound mixing The aim should be to place the microphone as close as physi cally possible to the source to cut out unwanted surrounding sounds allow a lower gain setting on the mixer and avoid feedback Also a well chosen an
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