120A - HARMAN Professional
Contents
1. SLEEVE SLEEVE H CI TIP CH L TIP gt CI RING XLR TVPE MALE MONO PHONE PLUG TO MALE XLR TVPE MONO PHONE PLUG TO STEREO PHONE PLUG FROM SOURCE DEVICE TO NEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE SLEEVE 4 SLEEVE SLEEVE P 3 A f TIP TIP TIP RING D XLR TYPE MALE RCA PHONO PLUG TO MALE XLR TVPE PHONO PLUG TO STEREO PHONE PLUG FROM SOURCE DEVICE TO NEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE SLEEVE A SE SLEEVE SLEEVE TIP TIP CI z D CH TIP 3 TPE gt MONO PHONE PLUG TO MONO PHONE PLUG PHONO PLUG TO MONO PHONE PLUG FROM SOURCE DEVICE TO NEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE SLEEVE SLEEVE SLEEVE CH SLEEVE b wa J ot D CI TIP G TIP G gt STEREO PHONE PLUG TO MONO PHONE PLUG MONO PHONE PLUG TO PHONO PLUG FROM SOURCE DEVICE TO NEXT DEVICE SLEEVE SLEEVE TIP TIP auf gt PHONO PLUG TO MALE XLR TYPE dbx I20A User Manual 7 by HARMAN dbx by HARMAN 8760 South Sandy Pkwy Sandy Utah 84070 Phone 801 568 7660 Fax 801 568 7662 Questions or comments Email us at support dbxpro com or visit our Website at www dbxpro com 18 2217 C Printed in USA2. DECLARATION OF CONFORMITV dbx Professional Products 8760 S Sandv Parkwav Sandv Utah 84070 USA Manufacturer s Name Manufacturer s Address declares that the product Product name dbx 120A Note Product name may be suffixed by the EU Product option None conforms to the following Product Specifications Safety IEC 60065 01 Amd 1 EMC EN 55022 2006 N A Analog Product IEC61000 4 2 IEC61000 4 3 IEC61000 4 4 IEC61000 4 5 IEC61000 4 6 IEC61000 4 8 IEC61000 4 11 Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 2006 95 EC EMC Directive 2004 108 EC RoHS Directive 2002 95 EC WEEE Directive 2002 96 EC With regard to Directive 2005 32 EC and EC Regulation 1275 2008 of 17 December 2008 this product is designed produced and classified as Professional Audio Equipment and thus is exempt from this Directive Roger Johnsen Vice President of Engineering 8760 S Sandy Parkway Sandy Utah 84070 USA Date November 1 2010 European Contact Your local dbx Sales and Service Office or Harman Music Group 8760 South Sandy Parkway Sandy Utah 84070 USA Ph 801 566 8800 Fax 801 568 7583 Introduction 0 1 Defining the T20A Eege REA i 0 2 Service Contact Info ii MA eg ii Section I Operation and Appendix 1 1 Rear Panel Connectons unsnsquuy qa 1 1 2 Front Panel Connections 4111 411112 1 1 3 Operating NOlES is s
3. Subwoofer Output Connector This output connector sends signal to your subwoofer amplifier the low bass signal which ranges from 20 Hz up to the crossover frequency 80Hz to 120Hz Nominal output signal level is 4dBu into 600Q and typical maximum output level is 22dBu into 600Q This output is an impedance balanced output C Crossover Selector Switch This switch is used to engage the crossover function D Output Connectors The output section of the 120A offers impedance balanced unbalanced 1 4 connections with a nominal output signal level at 4dBu into 600Q and typical maximum output level is 22dBu into 6002 E Input Connectors The input section of the 120A offers electronically balanced unbalanced 1 4 connections with a nominal input level of 4dBu and clipping level is at 22dBu into 600Q The 120A also offers RCA input connectors with a nominal input level of 10dBV and clipping at 8dBV 1 2 Front Panel Controls It B g Modeled Z 25 120A Subharmonic a Synthesis ZE F Power LED This red LED indicates that power has been applied to the 120A G Synthesis Bypass Pressing the SYNTHESIS BYPASS will engage when lit or bypass the Synthesis effect of the 120A H Crossover Select This button is used to the select the desired crossover frequency of the 120A When pressed and lit the 120Hz crossover frequency is engaged Otherwise the 80Hz frequency is used l Crossover LED This green LED
4. pair of smaller speakers and a 120A is more portable than a pair of two larger speakers Turntable Feedback and Low Frequency Rumble If you are using the 120A with a turntable the increased levels of bass may make your turn table system more susceptible to feedback wherein the turntable base platter cartridge stylus and or the disc itself actually pickup and replay bass from the speakers One symptom is an increasing flapping rumble as you turn the volume up severely the system begins to howl that disappears or is markedly reduced when the tonearm is lifted off the record The cure is to isolate the turntable making it immune to low frequency vibrations Any LF rumble in the system from turntable air conditioning through mics etc will be boosted by the 120A To reduce turntable feedback begin by locating the turntable and the speakers as far apart as practical Next short of replacing the turntable since some turntables are much more prone to feedback than others shock absorber feet designed specifically for this problem A massive base or table under the turntable may decouple it from the cases Note for CD Players High levels of Bass can cause CD players to skip It is a good idea to locate CD players away from low end drivers and loudspeakers and shock mount them dbx 120A User Manual by HARMAN 3 I 4 Connecting the I20A to Your System Basic Connection The 120A can be used with any line level device For more s
5. PPING OR SPLASHING LIQUID AND NO OBJECT FILLED WITHI LIQUID SUCH AS VASES SHALL BE PLACED ON THE APPARATUS CLEAN ONLY WITH A DRY CLOTH DO NOT BLOCK ANY OF THEVENTILATION OPENINGS INSTALL IN AC CORDANCE WITH THE MANUFACTURER S INSTRUCTIONS DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS HEAT REGISTERS STOVES OR OTHER APPARATUS INCLUDING AMPLI FIERS THAT PRODUCE HEAT ONLY USE ATTACHMENTS ACCESSORIES SPECIFIED BY THE MANUFAC TURER UNPLUG THIS APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME 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 third prong are provided for your safety If the provided plug does not fit your out let 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 with the cart stand tripod bracket or table specified by the manufac ture or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is dama
6. amplifier loudspeakers or other stereo components that results from the 120A When using the 120A or any other component in your system reduce the system s output level It is also recommended that all of the 120A front panel controls be set to fully counter clockwise to minimum MIN When installation is complete carefully return the system to normal listening levels and adjust the 120A to taste If clipping occurs lower the volume and decrease the 120A settings Note Never try to repro duce non musical sounds like artillery explosions or gunfire with the 120A 2 S Sp clone by HARMAN Avoiding Transients Any sharp noises from your sound system can be hard on your system and since the 120A amplifies and augments all low frequency information extra caution is called for at all times To be safe turn the power amp on last and off first and always keep the main volume control low or off when turning the system or any of its components on To further reduce the chance of dangerous transients make sure your system is operating at its optimum performance We recommend you have all switches button and knobs on your equip ment cleaned by a qualified person especially if any rasp or crackle is present If you are using a turntable check to make sure that the cueing is gentle Speaker Placement For systems with multiple speakers we recommend placing each speaker so that the distances from the center of its woofer to the th
7. dbx by HARMAN Subharmonic m Modeled gt z 120A Synthesis IMPORTANT SAFETY INFORMATION RISKOFELECTRIC SHOCK DONOTOPEN ATTENTION RisauEDECHOCELECTRIQUE NEPASOUVRIR WARNING roREDUCETHERISKOFFIRE ORELECTRIC SHOCKDONOTEXPOSETHISEQUIPMENTTORAINORMOISTURE The symbols shown above are internationally accepted symbols that warn of potential hazards with electrical products The lightning flash with arrowpoint in an equilateral triangle means that there are dangerous voltages present within the unit The exclamation point in an equilateral triangle indicates that it is necessary for the user to refer to the owners manual These symbols warn that there are no user serviceable parts inside the unit Do not open the unit Do not attempt to service the unit yourself Refer all servicing to qualified personnel Opening the chassis for any reason will void the manu facturer s warranty Do not get the unit wet If liquid is spilled on the unit shut it off immediately and take it to a dealer for service Disconnect the unit during storms to prevent damage SAFETY INSTRUCTIONS NOTICE FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD WARNING THIS APPLIANCE SHALL BE CONNECTED TO A MAINS SOCKET OUTLET WITH A PROTECTIVE EARTHING CONNECTION The cores in the mains lead are coloured in accordance with the following code GREEN and YELLOW Earth BLUE Neutral BROWN Live As col
8. e from defects in materials and workmanship under normal use and service 3 dbx liability under this warranty is limited to repairing or at our discretion replacing defec tive materials that show evidence of defect provided the product is returned to dbx WITH RETURN AUTHORIZATION from the factory where all parts and labor will be covered up to a period of two years A Return Authorization number must be obtained from dbx by telephone The company shall not be liable for any consequential damage as a result of the product s use in any circuit or assembly 4 dbx reserves the right to make changes in design or make additions to or improvements upon this product without incurring any obligation to install the same additions or improvements on products previously manufactured 5 The foregoing is in lieu of all other warranties expressed or implied and dbx neither assumes nor authorizes any person to assume on its behalf any obligation or liability in connection with the sale of this product In no event shall dbx or its dealers be liable for special or consequential damages or from any delay in the performance of this warranty due to causes beyond their control dbx 120A User Manual i by HARMAN i Modeled E Subharmonic ss Synthesis Sir dbx by HARMAN LI Rear Panel Connections A IEC Power Cord Receptacle This is the power cord receptacle of the 120A An IEC cord is included with the shipped product B
9. e recommend you refer to the manual Make sure you have correctly followed installation steps and operation procedures If you are still unable to solve a problem contact our Customer Service Department at 801 568 7660 for consultation If you need to return a product to the factory for service you MUST contact Customer Service to obtain a Return Authorization Number No returned products will be accepted at the factory without a Return Authorization Number Please refer to the warranty below which extends to the first end user After expiration of the warranty a reasonable charge will be made for parts labor and packing if you choose to use the factory service facility In all cases you are responsible for transportation charges to the factory dbx will pay return shipping if the unit is still under warranty Use the original packing material if it is available Mark the package with the name of the ship per and with these words in red DELICATE INSTRUMENT FRAGILE Insure the package prop erly Ship prepaid not collect Do not ship parcel post 0 3 Warranty This warranty is valid only for the original purchaser and only in the United States 1 The warranty registration card that accompanies this product must be mailed within 30 days after purchase date to validate this warranty Proof of purchase is considered to be the burden of the consumer 2 dbx warrants this product when bought and used solely within the U S to be fre
10. es of the original bass material producing a new Waveform Modeled bass note exactly one octave below the bass in the original audio signal path Unlike other attempts at bass synthesis the dbx Professional Products 120A process produces smooth musical low frequencies that do not interfere with mid and high band information even when the maximum synthesis and boost are applied The result is a low end punch that people really feel even at system levels that won t destroy sound equipment or damage hearing The 120A offers the following features Patented Modeled Waveform Synthesis Circuitry insures that mid and high frequencies are not affected Individual Controls for Two Separate ranges of Subbarmonic Frequencies plus Master Synthesis Level Control Separate Low Frequency Boost Circuit Separate Subwoofer Output 1 4 Balanced Inputs and 1 4 Impedance Balanced Outputs RCA Inputs LF Synthesis LED Indicators Selectable Crossover with 80Hz and 120Hz crossover points 120A User Manual dbx by HARMAN 0 2 Service Contact Info If you require technical support contact dbx Customer Service Be prepared to accurately describe the problem Know the serial number of your unit This is printed on a sticker attached to the rear panel If you have not already taken the time to fill out your warranty registration card and send it in please do so now Before you return a product to the factory for service w
11. ged 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 POWER ON OFF SWITCH If the equipment has a Power switch the Power switch used in this piece of equipment DOES NOT break the connection from the mains MAINS DISCONNECT The plug shall remain readily operable For rack mount or installation where plug is not accessible an all pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated into the electrical installation of the rack or building FOR UNITS EQUIPPED WITH EXTERNALLY ACCESSIBLE FUSE RECEP TACLE Replace fuse with same type and rating only MULTIPLE INPUT VOLTAGE This equipment may require the use of a different line cord attachment plug or both depending on the available power source at installation Connect this equipment only to the power source indicated on the equipment rear panel To reduce the risk of fire or electric shock refer servic ing to qualified service personnel or equivalent If connected to 240V supply a suitable CSA UL certified power cord shall be used for this supply IMPORTANT SAFETY INFORMATION ELECTROMAGNETIC COMPATIBILITY This unit conforms to the Product Specifications noted on the Declaration of Conformity Operation is subject to the following two conditions e this device may not cause harmful interference and e this device
12. isa kasi ad oi 2 1 4 Basic Connection aaa aaa aaa ae 4 Appendix A 1 Block Dia etait ad A R 5 A 2 Specifications aissein 6 A 3 Wiring Diagrams 7 Table of Contents EEN dbx INTRODUCTION Modeled 7277 120A a na Synthesis ME dbx by HARMAN Congratulations on your purchase of the dbx Professional Products 120A Subharmonic Synthesizer with Modeled Waveform Synthesis The 120A has been specifically optimized to enhance Bass audio material for use in a variety of professional applications including night club and dance DJ mixing theatre and film sound music recording live music performance and broadcasting The 120A s two separate bands of subharmonic synthesis provide the best combination of smoothness and control and the independent low frequency boost circuit is designed to get the most out of high performance low frequency speaker systems Flexible system interfacing is achieved by providing main outputs which can be full range including synthesis or high frequency ONLY along with a separate subwoofer output with its own level control This manual will be your guide to understanding the full functionality of the powerful 120A After you have become familiar with the unit we encourage you to experiment and find cre ative ways that the 120A can help you optimize your specific application The 120A s patented modeled Waveform Synthesis process builds a synthesized waveform using the wave shap
13. must accept any interference received including interference that may cause undesired operation Operation of this unit within significant electromagnetic fields should be avoided e use only shielded interconnecting cables U K MAINS PLUG WARNING A molded mains plug that has been cut off from the cord is unsafe Discard the mains plug at a suitable disposal facility NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET Do not use the mains plug without the fuse cover in place Replacement fuse covers can be obtained from your local retailer Replacement fuses are 13 amps and MUST be ASTA approved to BS1362 x If you want to dispose this product do not mix it with general household waste There is a separate collection system for used electronic products in accordance with legislation that requires proper treatment recovery and recycling Private household in the 25 member states of the EU in Switzerland and Norway may return their used electronic products free of charge to designated collection facilities or to a retailer if vou purchase a similar new one For Countries not mentioned above please contact vour local authorities for a correct method of disposal By doing so you will ensure that your disposed product undergoes the necessary treatment recovery and recycling and thus prevent potential negative effects on the environment and human health
14. ours of the cores in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The core which is coloured green and yellow must be connected to the terminal in the plug marked with the letter E or with the earth symbol or coloured green or green and yellow e The core which is coloured blue must be connected to the terminal marked N or coloured black e The core which is coloured brown must be connected to the terminal marked L or coloured red This equipment may require the use of a different line cord attachment plug or both depending on the available power source at installation If the attachment plug needs to be changed refer servicing to qualified service personnel who should refer to the table below The green vellow wire shall be connected directiv to the units chassis CONDUCTOR WIRE COLOR Normal Alt L LIVE BROWN BLACK N NEUTRAL BLUE WHITE GREEN E EARTH GND YEL GREEN WARNING If the ground is defeated certain fault conditions in the unit or in the system to which it is connected can result in full line voltage between chassis and earth ground Severe injury or death can then result if the chassis and earth ground are touched simultaneously WARNING FOR YOUR PROTECTION READ THE FOLLOWING KEEP THESE INSTRUCTIONS HEED ALL WARNINGS FOLLOW ALL INSTRUCTIONS THE APPARATUS SHALL NOT BE EXPOSED TO DRI
15. pecific cabling information refer to the Cable diagram on page 7 Mixer Amplifier Crossover Preamp Mixer Effects Loop Crossover Input Output e PROFESSIONAL PRODUCTS 1 Turn off all equipment before making anv connections 2 Mount the 120A in a 1U Rack Space optional The 120A requires one rack space It can be mounted above or below anvthing that doesn t generate excessive heat since it requires no special ventilation Ambient temperatures should not exceed 1130 F 450 C when equipment is powered Note Avoid over tightening of rackmounting screws as this could damage the front panel Caution Never remove the cover there are no user serviceable parts inside and vou run the risk of an electric shock 3 Make connections via 1 4 phone jacks or RCA jacks according to vour requirements Subwoofer Operation Set the CROSSOVER switch to CROSSOVER FULL RANGE mode and connect the amplification for the main speakers to the CHANNEL 1 CHANNEL 2 outputs In addition connect the Subwoofer to the Subwoofer Output Jack Operation without a Subwoofer Set the CROSSOVER switch to FULL RANGE and connect the amplification for the main speakers to CHANNEL 1 and CHANNEL 2 Output Tvpical patch points include a mixer s channel or subgroup inserts when using the 120A on individual instruments or tracks the mixer s main outputs when mixing an instrument preamps s effects loop when using the 120A for guitar or bas
16. red according to the following figures The output s impedance at 100Q allowing operation with virtually any load Nominal operating level is 4dBu into 600Q If using 1 4 mono plugs at the output the 120A will be grounded to the load device This can cause a ground loop By using 1 4 balanced phone plugs the grounds of both the 120A and the load can be isolat ed to reduce hum Leave the shield unconnected at the load device FROM SOURCE DEVICE TO NEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE ee y SLEEVE SLEEVE 6 KM TIP TIP Q RING D RING l XLR TYPE FEMALE XLR TYPE MALE FEMALE XLR TYPE TO STEREO PHONE PLUG STEREO PHONE PLUG TO MALE XLR TYPE FROM SOURCE DEVICE TO NEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE 53 TIP TIP amp Z 3 q RING RING D U U XLR TVPE FEMALE XLR TVPE MALE STEREO PHONE PLUG TO STEREO PHONE PLUG FEMALE XLR TVPE TO MALE XLR TVPE FROM SOURCE DEVICE TONEXT DEVICE FROM SOURCE DEVICE TO NEXT DEVICE SLEEVE
17. ree nearest boundaries are as different as possible These distances are measured along the speaker cabinet sides not in a straight line When these distances are the same the bass response of most speakers is roughest with peaks and dips more than 10dB apart over just a few notes Putting a conventional box shaped speaker woofer down in a corner will make it sound very bassy but for the evenness of bass it s the worst spot available The formula for calculating maximum different distances a b and c and least bumpy speaker placement is a b b c or b2 ac where a b and c are never equal The same acoustic laws apply to your listening position the smoothest bass will result when the distances from your head to the three nearest boundaries are as different as possible In the same manner the boomiest rooms have all three dimensions the same and the smoothest have them maximally different If you do reposition your speakers you should also reset any output level controls on the back of the speaker cabinet Many speakers offer a slight HF or MF boost with these controls all the way up and the new increase in bass might be better balanced by such a maximum setting The 120A is not intended only as a device to create wall crumbling low end Judicious use with a pair of full range speakers can create the sense that a pair of speakers with 15 woofers is being used An additional benefit of improving the sound of smaller speakers is that a
18. s RCA Inputs 0 05 no synthesis either output 88dBu controls max 22Hz gt 22kHz unweighted full range output 26 36Hz and 36 56Hz Band Synthesis Level Subharmonics Low Frequency Boost Subwoofer Output Crossover Frequency Select Crossover in out Power Crossover Bypass Synthesis activity 3 LEDs per band 112dB 26 56Hz from 54 110Hz input signal 12dB octave high pass 3dB 80 Hz or 120Hz 6dB octave derived low pass Phase coherent unity sum 100 120VAC 50 60Hz DO Version 220 240VAC 50 60Hz EU Version 1 75 x19 x6 2 4 5cm x 48 3cm x 15 75cm 1 Rack Unit 4 75 Ibs 8 Ibs 2 2kg 3 7kg 6 by HARMAN A 3 InstallationConsiderationsand Wiring The 120A has 1 4 balanced unbalanced inputs and is designed for nominal 4dBu levels The 120A also offers RCA connectors and is designed for nominal 10dBV levels Input Cable Configurations The 120A will accept either balanced or unbalanced sources as long as cables are wired according to the following diagrams In an emergency 1 4 mono cables will work Connect the sleeve to the cable s shield Note for maxi mum hum rejection with a balanced source avoid common grounding at the 120A s input and output The best start ing point is to ground the shield of the input cable at the source device leaving it unconnected at the 120A Output Cable Configurations The 120A will drive either balanced or unbalanced loads as long as the cables are wi
19. s main outs of a submixer as the signal is sent to main mixer The 120A can be used either before or after an external electronic crossover When using a chain of processors the 120A should generally be placed as far down the chain as possible We recommend you use common sense and experiment with different setups to see which one provides the best results for your needs 4 Plug in the AC power cable to power On the unit Note Check the line voltage The 120A is shipped for 115V or 230V 50Hz or 60Hz opera tion Refer to the unit s rear panel to verify your unit s precise line voltage 4 p x by HARMAN ssedAq Appendix A l Block diagram J9AOSSO1JJ CH A Ee andino JaJooMQNS CH SJIUOWAIEH ZH ZH 3soog qns 9S 9E JET sis unu s Cu Oli ZHOE DT ZH9S 9 ZH08 5 dbx 120A User Manual by HARMAN A 2 Specifications Frequency Response Input Impedance Maximum Input Level Output Impedance Maximum Output Level Connector Type THD Output noise Front Panel Controls Indicators Metering Dynamic Range Synthesis Frequency Range Crossover Power Requirements Dimensions Rack Space Weight Net Shipping 20Hz 20kHz 0 5dB no synthesis full range mode 15Hz 90kHz 0 3dB gt 40kQ Balanced or 20kQ unbalanced 1 4 20kQ RCA 22dBu 1 4 8 5dBV RCA 10002 Impedance balanced 22dBu into 6000 1 4 TRS Jacks Inputs and Output
20. vel Controls These controls individually let you customize the amount of the respective synthesized fre quencies to be added in tuning the ultimate bass response of your system to taste For example if the sound is too woofy or growly try turning down the 36Hz 56Hz level If your woofers are bottoming out making a ticking popping sound or fuses are blowing or your amp is clipping try turning down the 24Hz 36Hz level You may find that a setting produces fine results in one room but produces too much boominess in another If this occurs adjust the controls as needed e g increase one or the other of the band levels Experimentation will pay off with smooth full deeply extended bass Remember you are not selecting a fre quency You are controlling the overall level of each band 1 3 Operating Notes Setting Levels Do not use the 120A at its extreme settings with loud volume levels especially with digitally produced audio Very low bass frequencies call for considerable amplifier power and for loudspeakers that can take this considerable power However the 120A not only can boost the bass that is present in the original program but can simultaneously generate sizable amounts of new bass at even lower frequencies If not used with care the 120A can damage system components e g woof ers can be readily damaged by very loud bass intentional or otherwise dbx Professional Products cannot take responsibility for any damage to the
21. when lit indicates that the active crossover has been selected In this case the mains outputs channel 1 and channel 2 contain only the high frequency portion of the signal while the low frequency portion appears at the mono Subwoofer output dbx I20A User Manual lI by HARMAN J Subwoofer Level Control This control sets the level of the low frequency crossover signal original program plus synthe sized harmonics coming out of the SUBWOOFER jack K LF Boost Control This control is used to even out the total apparent Bass output of the 120A Use the LF Boost to gently boost the bass on each channel after the harmonics are summed in to fill in the gap between the synthesized low bass below 55 Hz and the mid bass of the original pro gram Always be careful of using excessive boost especially if the Subharmonics control is past its midpoint or if you are using a speaker equalizer or any other bass tone control LF BOOST can be used with or without Subharmonic Synthesis L Subharmonics Control This control along with the individual frequency controls sets the amount of synthesized bass that the 120A adds to the program Its affect depends not only on where it is set between MIN and MAX but also on how much bass is present in the original signal to be augmented Note that the effect will be most apparent in systems with subwoofers or other speakers that effec tively reproduce very low bass tones M 24Hz 36Hz and 36Hz 56Hz Le
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