HA5500 - American Musical Supply
Contents
1. 02020202080 an e 00000 47 m 7 090909090909 075729090909 173 GRAPHIC EQUALIZER 30Hz 64Hz 125Hz 250Hz 500Hz 1KHz 2KHz 3KHz 5KHz 8KHz N an CY 3 65 4 3 6 SAEC 7 2 M8 20 T m D hy 10 TUBE SOLID STATE 8 COMPRESSION LOW PASS HIGH PASS VOLUME 30Hz 64Hz 125Hz 250Hz 500Hz 1KHz 2KHz 3KHz SKHz 8KHz OFF 500 WATT BASS AMPLIFIER Owners Manua Introduction Features Guided Tour Front Panel Rear Panel Setting Up and Using the HA5500 About Equalization About Compression Appendix A Block Diagram Appendix B Changing the HA5500 Voltage Specifications 4 5 6 7 10 11 12 13 14 15 Introduction Congratulations on purchasing the Hartke HA5500 Bass Amplifier Although this unit is designed for easy operation we suggest you first take some time to go through these pages so you can fully understand how we ve implemented number of unique features The HA52. bass guitar has active circuitry connect it to the Model 5500 here This standard 1 4 unbalanced jack provides a high imped ance 100 k Ohms input sensitivity of 60 millivolts 3 Pre Amp A Tube control This determines the amount of preamplification being provided by special circuitry which delivers the sound of a classic tube amplifier this circuitry actually includes a real tube Note that when both Pre Amp knobs are used at equal settings the amplifier will be twice as loud as when only one is used Avoid setting both Pre Amp knobs on maximum 10 since the result will almost always be undesirable distortion 4 Pre Amp B Solid State control This determines the amount of preamplifi cation being provided by special circuitry which delivers the sound of a solid state amplifier Note that when both Pre Amp knobs are used at equal settings the amplifier will be twice as loud as when only one is used Avoid setting both Pre Amp knobs on maximum 10 since the result will almost always be undesirable distortion 5 Compression LED Provides a visual indicator of the status of the compression circuitry When lit steadily green for example when the Compression knob see 6 on the next page is set to Off no compression is being applied When unlit compression is being applied to the incoming signal at a ratio of approximately 2 1 When flashing red the compression ratio is approaching infinity limiting is
3. being applied to peak signals When lit steadily red the entire signal is being limited This LED follows the incoming signal changing continuously as different amounts of compression and or limiting are being applied For more information see the About Compression section on page 15 of this manual Bass guitars that have active circuitry normally require a battery for the circuitry to be functional 4 Guided Tour HA5500 Front Panel 6 Compression control This determines the amount of compression peak sig nal reduction by simultaneously adjusting both threshold and compression ratio which ranges from 2 1 to infinity limiting At the fully counterclockwise Off position the circuitry is bypassed and no compression is applied the knob clicks when set to the Off position As the knob is raised clockwise at set tings from 1 to increasing amounts of compression are applied For more information see the About Compression section on page 15 of this manual 7 Graphic Equalizer In Out switch When pressed in the In position the Model 5500 s graphic equalizer circuitry as described in 8 below 15 operational When pressed out the Out position it is bypassed The provision of this switch allows you to set up a custom equalization curve an equalization preset with the graphic EQ sliders which can then be activated with the press of a single button 8 Graphic Eq
4. out and all notes played have pretty much the same level The front panel Compression control determines the amount of compression peak signal reduction by simultaneously adjusting both threshold and compres sion ratio which ranges from 2 1 to infinity limiting At the fully counterclock wise Off position the circuitry is bypassed and no compression is applied the knob clicks when set to the Off position As the knob is raised clockwise at settings from 1 to increasing amounts of compression is applied At the highest settings loud sounds will not just be compressed but limited where the output remains virtually constant regardless of input The Model 5500 provides a front panel Compression LED which acts as a use ful visual indicator of the continuous activity of the compression circuitry When lit steadily green for example when the Compression knob is set to Off no compression is being applied When unlit compression is being applied to the incoming signal at a ratio of approximately 2 1 When flashing red the compression ratio is approaching infinity limiting is being applied When lit steadily red the signal is being limited This LED follows the incoming signal changing continuously as different amounts of compression and or limiting are being applied Compression has three main uses First as just described it evens out the notes played by your bass so that they all appear at vi
5. shown in the illustration on the right For a twangy cutting sound try boosting the high and high mid range frequencies as shown in the illustration on the right putting new roundwound strings on your bass will help a lot also Whenever you get a really good EQ setting for a particular instrument or song write it down you d be amazed how easy it is to forget these things Finally as you experiment with the EQ controls of the Model 5500 don t forget that your bass also provides EQ controls in the form of its tonal settings this can be particularly effective in instruments that have active circuitry Also try various EQ settings with different Pre Amp blends and with and without Compression For more information see the About Compression section on the following page 11 About Compression HA5500 Compression control and LED The dynamic range of a sound is the difference between its loudest and softest points For example as you play your bass you ll probably find that some notes for example notes played on the upper frets of the lowest string are considerably louder than others The function of the Compression circuitry in the Model 5500 Bass Amplifier is to reduce overall dynamic range by automati cally reducing the level of the loudest sounds you play so that they are closer in level to softer ones the end result is that the sound evens
6. 0 dBM 16 17 Samson Technologies Corp 575 Underhill Blvd P O Box 9031 Syosset NY 11791 9031 Phone 1 800 3 SAMSON 1 800 372 6766 Fax 516 364 3888 www samsontech com
7. 500 provides 500 watts of power to a 4 speaker system or 350 watts to an 8 onm speaker system With that kind of power the HA5500 15 EXTREMELY loud and punchy In addition the HA5500 offers a number of additional advanced features including front panel compression and graphic equalizer LED indicators effects send and return jacks an effects send return balance knob and a direct output with ground lift and pre or post EQ selection The HA5500 15 optimized for use with electric bass instruments and the front panel controls in both models are virtually identical You ll find either to be an excellent bass amplifier for live performance use in small and medium size ven ues in addition the HA5500 s advanced pre amp features makes it ideal for use in recording environments In these pages you ll find a detailed description of the many features of the HA5500 bass amplifier as well as a guided tour through their front and rear panels step by step instructions for setting up and using each product detailed discussions about equalization and compression and full specifications You ll also find a warranty enclosed please don t forget to fill it out and mail it so that you can receive online technical support and so we can send you updated information about these and other Hartke and Samson products in the future SPECIAL NOTE Should your unit ever require servicing a Return Authorization number RA is necessary Without this
8. ally the same effect as turn ing down the Master Volume Both approaches are pointless after all that s why we gave you a Master Volume control In many instances the best way to deal with equalization is to think in terms of which frequency areas you need to attenuate as opposed to which ones you need to boost Be aware that boosting a frequency area also has the effect of boosting the overall signal specifically too much low frequency EQ boost can actually cause overload distortion or even harm a connected speaker though the Model 5500 s compression circuitry if on will act to some extent to pre vent this from occurring In general if you re going to apply a fair amount of low frequency EQ boost it s a good idea to keep Compression on if only to protect your speakers from potential damage The specific EQ you will apply to your bass signal is very much dependent upon your particular instrument and personal taste and playing style However here are a few general suggestions For that super deep reggae Motown sound boost low frequencies slightly while attenuating the highest ones leave mid range frequen cies flat or slightly attenuated as shown in the illustration on the right GRAPHIC EQUALIZER 30Hz 64Hz 125Hz 250Hz 500Hz 1KHz 2KHz 3KHz 5KHz 8KHz To remove boxiness and make your instrument sound more hi fi try attenuating mid range frequencies while leaving low and high frequen Cy settings flat as
9. ate knobs to 5 the twelve o clock position Set the Compression knob to its Off position fully counter clockwise you ll hear a click and set both Contour knobs to their center detented O position Finally set the graphic equalizer In Out switch to its Out position 5 Press the front panel Power switch in order to turn on the amplifier After approximately three seconds you ll hear a click indicating that the relay protection circuitry has completed cycling and that power to the system has been provided 6 Set the output of your bass to maximum and then while playing slowly turn the Master volume control up until the desired level is achieved If you hear distortion even at low amplifier Master volume settings back off the output of your bass or check for a faulty cable Bass guitars that have active circuitry normally require a battery for the circuitry to be functional Setting Up and Using The HA5500 7 Experiment with altering the balance of the two Pre Amp knobs listening to the effect each has on the overall sound Depending upon the specific instru ment you are using and your personal taste you may prefer the sound of one over the other or you may prefer a particular blend of the two Note that when both are used at equal settings the amplifier will be twice as loud as when only one is used In step 4 on the previous page we recommended that you begin with both knobs at their midway 5 setting
10. beneath the 2 Remove fuse sled fuse sled and gently press in and up The fuse sled will pop out approximately 3 8 inch 3 Use a small pair of needlenose pliers to gently pull out the mains jumper 4 Use the needlenose pliers to reverse the mains jumper so that the other voltage value is facing outwards then reinsert the mains jumper Finally reinsert the fuse sled by gently pushing it back in until you hear a click Note that the fuse sled carries two fuses one for 115 volt operation actually 105 120 volts and another for 230 volt operation actually 220 240 volts The position of the two fuses in the sled as well as the fuse ratings must be maintained for adequate protection Fuse ratings for the Model 5500 are 10 amp for 115 VAC and 6 2 amp for 230 VAC 14 Specifications Input Sensitivity Passive Input Active Input Rated Output Power Total Harmonic Distortion Signal To Noise Ratio Equalizer Contour Low Pass Contour High Pass Ten Band Graphic Compression Ratio Send Output Level Return Input Level 15 100 k Ohms 20 mv 100 k Ohms 60 mv 500 watts A ohms 350 watts 8 ohms less than 5 approx 78 dBm 18 dB 100 Hz 18 dB 10 kHz 15 dB center detented 30 Hz 64 Hz 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz kHz 5 kHz 8 kHz 2 1 to infinity 0 dBM
11. but the two Pre Amp knobs can in fact be set to any blend you like However you will usually want to avoid setting both to their maximum 10 position since this setting will almost always result in undesirable distortion mE 8 When you have settled on a Pre Amp balance the next step is to adjust the two Contour bass and treble equalizer controls to taste For more information see the About Equalization section on page 13 of this manual When you get a great setting that complements your instrument and playing style 15 a good idea to write it down for future use 9 Next experiment with the Model 5500 graphic equalizer Begin by setting each of the ten sliders to their flat 0 center detented position Then press in the In Out switch to its In position so that the graphic equalizer is activated Finally move each slider in turn as you play your bass For more information see the About Equalization section on page 13 of this manual Again when you get a graphic equalization setting that complements your instrument and playing style its a good idea to write it down for future use GRAPHIC EQUALIZER 5Hz 250Hz 500Hz 1KHz 2K 10 Now try out the Model 5500 compression circuitry Activate it by turning the Compression knob clockwise from its Off position you ll hear a click when it is activated As you turn the knob clockwise the input signal from your bass becomes more more severely compress
12. e bass cabinets although other brands of speakers can be used 4 Fan The fan provides vital cooling to your Model 5500 Make sure that it is kept free of all obstructions and that cool fresh air is accessible at all times Also try to ensure that the Model 5500 is used in a dust free environment Guided Tour 5500 Rear Panel 5 Effect Send jack Use this 1 4 unbalanced jack to send low impedance 100 ohm signal from the Model 5500 to a professional outboard effects processor such as a reverb echo chorus flanger or harmonizer device Output level 15 approximately O dB to 4 dB and 15 post EQ and post compression but unaffect ed by the setting of the Master Volume control You can also use the Effect Send jack to route signal to an external mixing console or amplifier with an input sensitivity of 4 dB 6 Effect Return jack Use this 1 4 unbalanced jack to return low impedance 600 ohm signal to the Model 5500 from a professional outboard effects processor 7 Balance control Use this to adjust the relative amount of Effect Send dry versus Effect Return wet signal being routed to the Model 5500 speaker outputs At the center detented 0 position equal amounts of Send and Return signal are routed At its fully counterclockwise Send position no signal from a connected effects processor s is added to the main output At its fully clock wise Return position the only signal you hear is that comin
13. e partic ular frequency area is being boosted when it is moved below center towards 15 the frequency area is being attenuated We carefully selected these frequency areas because they have maximum impact on bass signals For example the lowest slider 30 Hz affects the very lowest audible frequencies in fact most humans cannot hear below 20 Hz while the highest four sliders 2 3 5 and 8 kHz affects the twang of a bass string WARNING Use caution when raising the 30 Hz slider above 0 if you are operating at high volume levels especially if Compression is not being used since this can place undue stress on connected loudspeakers 10 About Equalization To find out how each graphic equalizer slider affects the sound of your particu lar bass start with all ten bands flat that is all ten sliders at their detented center position Then one by one raise and lower each slider listening care fully to the effect of each If you don t specifically need to utilize the ten band graphic equalizer bypass it by setting the In Out switch to its Out position Alternatively you can preset a custom graphic equalization curve for exam ple for a feature solo and activate it simply by pressing the switch when needed Note that turning all EQ controls up the same amount will have virtu ally the same effect as simply turning up the Master Volume conversely turn ing them all down the same amount will have virtu
14. ed you ll hear peak signals such as string slaps and pulls begin to sound increasingly squashed relative to the lower level signals produced by standard playing The result will be a decreased dynamic range but an overall leveling of signal throughout the full pitch range of your instrument For more information see the About Compression section on page 15 In the Model 5500 the Compression LED will light steadily green when no compression is being applied will go out when ever small amounts of compression are being applied and will flash or light steadily red when limiting severe compression is being applied 11 If you re using an external signal processor turn your Hartke amplifier off momentarily and then connect a standard audio cable between the Effect Send jack and your effects processor input and another standard audio cable between the Effect Return jack and your effects processor output if required multiple effects processors can be daisy chained together output to input When you are using a Hartke 5500 start with the effect Balance knob at its center detent ed 0 position so that you hear equal amounts of both the send and return sig y dE nal Then turn the amp back on and play your bass while adjusting the con A AR trols of your outboard effects processor s For best results set both the input 7 and output gain of all connected effects processor s to O dB unity gain so that there is
15. ency bands A Graphic Equalizer provides 15 dB of cut or boost in ten narrow fre quency bands Normally you will adjust the two Contour controls before fine tuning your EQ with the Graphic Equalizer The Low Pass Contour control affects a broad band of frequencies with 100 Hz as the center point similarly the High Pass Contour control affects a broad band of frequencies with 10 kHz as the center point When either is in its center detented position 0 it is having no effect When it is moved right of center the particular frequency area is being boosted when it is moved left of center the frequency area 15 being cut attenuated Because there 15 very little bass guitar energy at 10 kHz the High Pass Contour control should be thought of as your overall noise control turning it down to the left of the O position will help to eradicate hiss and buzz while having very little effect on the bass guitar signal Similarly the Low Pass Contour control when set left of O can be used to eliminate rumble and woofiness The ten band graphic equalizer provides ten sliders each corresponding to a single narrow frequency band at 30 Hz 64 Hz 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 3 kHz 5 kHz and 8 kHz This allows you to draw the desired tonal response of your system When a slider is in its center detented position 0 it is having no effect When it is moved above center towards 15 th
16. ets although other brands of speakers can be substituted Any appropriately rated bass cabinet with a minimum imped ance of 4 ohms that is 4 ohms or greater can be used In order to ensure correct phase correlation the tip of the Model 5500 speaker jack should be con nected to the hot input of your loudspeaker and the sleeve of the Model 5500 speaker jack should be connected to the ground input of your loud speaker WARNING Hartke amplifiers can deliver very high power levels Driven to full power they can damage connected loudspeakers regardless of brand size or configuration Care should be taken not to strain connect ed loudspeakers as this can cause permanent damage and will degrade the performance of the entire system If you see connected loudspeakers moving excessively turn your system down immediately or use the equal ization and or compression controls to reduce the amount of subharmon ic extremely low frequency signal 3 Next connect the 3 pin AC plug into any grounded AC socket Don t turn the amplifier on just yet though 4 Use a standard music instrument cable to connect your bass to the appropri ate Input jack on the front panel if your bass has active circuitry connect it to the Active input if not connect it to the Passive input On the front panel of the Model 5500 set the Master volume control to 0 fully counterclockwise and set both Pre Amp A Tube and B Solid St
17. eturn jacks that allow you to connect to professional outboard effects processors An effect Balance knob which enables you to adjust the relative amount of Send dry versus Return wet effect signal being routed to the speaker outputs Electronically balanced direct output that provides a means of routing signal to professional mixing consoles in both live performance and recording environments A ground lift switch helps prevent hum or buzz from entering the signal and a pre post switch allows the direct signal to be derived either before or after the amp EQ section LEDs that show you the settings of the graphic equalizer in low light envi ronments as well as a two color LED that continuously shows the status of the compression circuitry in response to your playing Rugged construction makes the HA5500 eminently road worthy Guided Tour HA5500 Front Panel 0020202020202020 SS DL 4 SPIELE LS LLG LS LS IE PEL IH 000000 e99999999999996999996 999999999996 0000006000000 92527 1 Passive Input jack If your bass guitar has passive circuitry connect to the Model 5500 here This standard 1 4 unbalanced jack provides a high imped ance 100 k Ohms input sensitivity of 20 millivolts 2 Active Input jack If your
18. g console or as a tap to a main PA system via a mic input on the console The signal output from this jack is low impedance 100 ohm with an output level of approximately 30 to 20 dB You can also use the Direct Out jack to route signal to an external amplifier with a 10 dB input sensitivity n line effects such as footpedals intended for low signal levels should be placed between the bass and the amplifier Input and not connected with the Effect Send and Return jacks Note that the settings of the ten band graphic equalizer will affect a Post Direct Out signal regardless of the position of the front panel In Out switch Setting Up and Using the HA5500 INPUT Setting up your Hartke Systems 5500 Bass Amplifier is a simple procedure which takes only a few minutes 1 Remove all packing materials save them in case of need for future service and decide where the amplifier is to be physically placed To avoid potential overheating problems be sure that the rear panel is unobstructed and that there is good ventilation around the entire unit particularly behind the rear panel fan 2 Begin by hooking up your bass cabinet or cabinets using the 1 4 unbal anced Speaker output connectors on the rear panel it is never a good idea to power up any amplifier that is not connected to loudspeakers We recommend the use of a single 4 ohm cabinet or two 8 ohm cabinets Hartke amps are opti mized for use with Hartke bass cabin
19. g from connect ed outboard effects processor s If your outboard effects processor has an adjustable wet dry control we recommend that you set the Balance knob to its fully clockwise Return position and use the effects processor s wet dry control to adjust the relative mix Alternatively you can set the effects processor to output fully wet signal and use the Model 5500 Balance knob to adjust the relative mix of dry vs wet signal 8 Direct Out Post Pre switch When pressed in the Pre position signal is routed to the Direct Out jack prior to the Model 5500 ten band graphic equalizer but after the compression circuitry and Contour controls When out the Post position signal is routed to the Direct Out jack after all compression and EQ circuitry both ten band graphic and Contour Use the Pre position when you want the console engineer to have control over equalizing your bass signal use the Post position when you want to use the front panel ten band graphic equalizer to equalize your bass signal before sending it to the console 9 Direct Out Normal Ground Lift switch When pressed in the Gnd Lift posi tion pin 1 is removed from the chassis This should be used only when a ground loop hum or buzz is heard otherwise leave it in the out Normal position 10 Direct Out jack Use this electronically balanced XLR jack to route signal from the Model 5500 to a professional mixin
20. hic equalizer as described in 8 above For more information see the About Equalization section on pages 13 14 of this manual 11 Master Volume control This is the overall volume control For best signal to noise ratio keep the output of your bass at or near maximum and adjust the 5 Master Volume to the desired level 12 Power LED Lights whenever the Model 5500 is powered on 13 Power switch Use this to power the Model 5500 on or off Guided Tour HA5500 Rear Panel Hartke Systems Distributed Exclusively by Samson Technologies Corp Hicksville New York 11802 MODEL 5500 350 WATTS 8 350 WATTS 500 WATTS 1 Fuse sled This contains a fuse holder and shows the currently selected voltage rating for your Model 5500 Make sure the voltage rating is correctly set before powering up the amplifier Fuse ratings are 10 amp for 115 vac and 6 2 amp for 230 vac For information on how to change the voltage rating see Appendix C on page 18 2 AC input Connect the supplied standard 3 pin IEC plug here 3 Speaker outputs Connect any 4 8 or 16 ohm bass cabinet s to these standard unbalanced 1 4 jacks WARNING Because of the high power lev els and low frequency content of the signal generated by the Model 5500 use only appropriately rated speaker cabinets at least 600 watts at 4 ohms that are specifically designed for bass instruments We recommend that Hartke ampli fiers be used with Hartk
21. no increase or decrease in level whether the effects are switched in or out SEND RETURN Model 5500 Effect Send Return jacks and 22 Balance control If you have followed all the steps above and are still experiencing difficulties call Samson Technical Support 516 932 1062 between 9 AM and 5 PM EST For more information on the use of the Hartke 5500 effect Balance control see page 7 in this manual About Equalization CONTOUR LOW PASS HIGH PASS Contour controls GRAPHIC EQUALIZER 30Hz 64Hz 125Hz 250Hz 500Hz 1KHz 2KHz 3KHz 5KHz 8KHz 9 Ld LA LL L ESE 9 E D E D Graphic equalizer The Hartke Systems Model 5500 Bass Amplifier gives you enormous control over shaping the sound of your bass using a process called equalization To understand how this works it s important to know that every naturally occurring sound consists of a broad range of pitches or frequencies combined together in a unique way This blend is what gives every sound its distinctive tonal color EQ controls allow you to alter a sound by boosting or attenuating specific fre quency areas they operate much like the bass and treble controls on your hi fi amp but with much greater precision The Model 5500 provides you with two different means for equalizing your bass sound Low Pass and High Pass Contour controls provide 18 dB of cut or boost in two broad frequ
22. number the unit will not be accepted Please call Samson Technologies at 516 932 1062 for a Return Authorization number prior to shipping your unit Please retain the original packing material and if possible return the unit in its original carton and pack ing materials Features The Hartke HA5500 bass amplifier offers all the newest concepts in bass ampli fication Here are some of its main features Power to spare The HA5500 a full 500 watts delivered to a 4 speaker system or 350 watts to an 8 onm speaker system Our unique Transient Attack circuitry which ensures that every nuance of your bass performance is reproduced faithfully Two Pre Amp input knobs allowing custom blending of tube and solid state sounds Ten bands of high quality graphic equalization allowing you to create a broad range of tonal colors for your bass instrument A dedicated in out button allows you to preset an equalization curve Two fully adjustable contour knobs high pass and low pass which provide further control over shaping your bass sound A built in compressor which not only adds real punch to your bass sound but also allows you to smooth out volume differences between notes Two independent inputs that accommodate both passive and active bass guitars Protection relay circuitry that protects connected speakers from dangerous overloading and also prevents thumps when powering on or off Effect loop send and r
23. rtually equal level Second it adds punch to a sound since all levels are nearly the same you can play with greater force without worrying about the loudest notes distorting Finally it serves to protect your loudspeakers from damage as a result of brief transient high output levels as might be caused by finger popping or other performance techniques Whether or not you need to use compression with your Model 5500 will be a matter of personal taste and playing style experiment and see if you like the effect If you usually play at low volume levels you ll find that even with the Compression knob turned up the compression circuitry may have no audible effect so it might as well be off In general if you don t need compression leave it off 12 Appendix A Block Diagram SEND 50 mV IN COMPRESSOR 0 dB 4dB IN OUT SWITCH p e RETURN ES DETECTOR VCA CONTOUR 10 BAND EQ 2 Y O O POST E O 3 50 mV OUT q 20 dB TO 30 dB 10 BAND OUT GND LIFT NORMAL o 10 BAND IN SA MASTER SECTION I I I I PROTECTION zu lt Model 5500 13 Appendix Changing the HA5500 Voltage Following are step by step instructions for changing the mains voltage of the Model HA5500 WARNING Before carrying out this operation remove the power cord 1 Insert a small screwdriv er into the slot
24. ualizer These sliders allow you to draw the tonal response of the system by adding 15 dB of boost or attenuation to ten different narrow band frequency areas 30 Hz 64 Hz 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 3 kHz 5 kHz and 8 kHz affecting the main output signal of the Model 5500 When a slider is at its center detented 0 position the selected frequency area 15 unaffected it is said to be flat When a slider is moved up above the 0 position towards the 15 position the selected frequency area is boosted and when it is moved down below the 0 position towards the 15 position the selected frequency area 15 attenuated For more information see the About Equalization section on pages 13 14 of this manual 9 Contour Low Pass control This acts as a broad band low frequency equal izer providing 18 dB of boost or attenuation at 100 Hz You should generally adjust this control and the Contour High Pass control described in 10 below prior to fine tuning the system with the graphic equalizer as described in 8 above For more information see the About Equalization section on pages 13 14 of this manual 10 Contour High Pass control This acts as a broad band high frequency equalizer providing 18 dB of boost or attenuation at 10 kHz You should generally adjust this control and the Contour Low Pass control described in 9 above prior to fine tuning the system with the grap
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