Adcom GFA-4702 User's Manual
Contents
1. GFI to GFA GFX 100 100 roll of 5 Conductor Shielded Cable GXL F Female 5 Pin XLR Connector GXL M Male 5 Pin XLR Connector GXL R Right Angle Female XLR 5 Pin Connector GFC 5 5 Power Interface Cable for GFA 4702 GFC 20 20 Power Interface Cable for GFA 4702 GFM xx Crossover Resister Modules for GFI 4600 xx denotes frequency 50 60 70 85 120 150 180 200 270 400 600 and 3350 Hz 11 Elkins Road E Brunswick NJ 08816 Phone 908 390 1130 Fax 908 390 5657 Copyright 1994 Adcom Car Audio Inc All Rights Reserved djg6942. configurations simultaneously In order to achieve this one channel must be inverted at the input Inverting simply means making the positive lead negative and the negative lead positive For consistency we recommend that the B or RIGHT channel be inverted In addition the same channel s output must be inverted to complete the process Inverting techniques will be discussed in sections 2 and 3 INPUT SENSITIVITY SETTING Located on the end panel along with the input connectors are two small openings that house the input sensitivity controls THEY ARE NOT AMPLIFIER VOLUME CONTROLS When properly set they match the output of the source unit with the input of the amplifier If you wish to have the amplifier and source unit properly matched consult your authorized ADCOM Car Audio dealer Optimal performance and the advantages of passively terminated balanced inputs are realized when sensitivity controls are turned fully clockwise Since the sensitivity controls affect only the positive inputs the controis MUST be fully clockwise in the MaSt or mono configurations CARE AND CLEANING Great care has been taken by ADCOM to assure that your amplifier is as flawiess in appearance as it is electrically in the event that your ADCOM amplifier needs cleaning use a damp cloth or dry soft bristled paint brush Do not use cleaning fluids of any kind as damage to the finish may result Treat this product as a precision i
3. B Plugs GFA 4302 o FAEN GFA 4402 Power Antenna or Remote Lead at the GFI 4600 and us pos inputs on GFA 4302 4402 This yieids best results GFA 4304 or GFA 4404 L Front R Rear L Front R Rear R Front L Rear R Front L Rear BE CERTAIN OF POWER GROUND CONNECTIONS Fig 12 GFA 4702 2 Channel without GFI 4400 or 4600 Ip or Remote A Power Antenna a LJ Lead i BiZ a 12V O QUO RL Ign GFA 4702 Power Supply Section Follow color codes as labeled GFA 4702 Amplifier Section CL Jet CE iLp E CERTAIN OF POWER GROUND CONNECTIONS Fig 13 FA 4702 1 Channel Mono with GFI 4600 GFA 4702 k A Power asi VY Supply Section GFA 4702 Amplifier Section BE CERTAIN OF POWER GROUND CONNECTIONS Fig 14 AVAILABLE ACCESSORIES ADAPTERS GFY 1 Adapts XLR Input to Mono RCA type Input GFY 2 Adapts XLR Output from GFI 4600 to RCA type Input of Amplifier GFY 3 Adapts XLR Input to RCA type Input to operate Amplifier in the MoSt or Mono Configuration GFY 4 Adapts XLR Input to RCA type Input to operate Amplifier in Stereo GFY 5 Converts 4 Channel ADCOM Amplifier to operate as a 2 Channel Amplifier CABLES amp MISCELLANEOUS GFX 2 5 30 5 Pin Female XLR to XLR 2 Channel Extension Cable GFI to GFA GFX 20 20 5 Pin Female XLR to XLR 2 Channel Extension Cable
4. cable to A input and the right cable to B input Speakers hook up normally A and A outputs to LEFT speaker s pos amp neg and B and B outputs to the RIGHT speaker s pos amp neg See Fig 2 Remember to insert the RCA Shorting Plugs in the unused inputs BE CERTAIN OF POWER GROUND CONNECTIONS Fig 2 In the Mono mode the LEFT RCA cable connects to A input the RIGHT RCA cable connects to B input Remember to insert the RCA Shorting Plugs in the unused inputs The speaker outputs connect to the speaker as follows A output connects to the Positive speaker terminal B output connects to the Negative speaker terminal see Fig 3 ADCOM car audio amplifiers are stable driving a 1 Ohm mono load but it is not recommended For best results maximum SPL and low THD we suggest a 2 or 4 Ohm mono load BE CERTAIN OF POWER GROUND CONNECTIONS Fig 3 in the MoSt configuration the amplifier is capable of driving multiple pairs of stereo speakers properly crossed over and multiple mono subwoofers simultaneously To wire the MoSt configuration connect the LEFT RCA to the A input connect the RIGHT RCA to the B input Remember to insert the RCA Shorting Plugs in the unused inputs Wire speakers as shown in Fig 4 LEFT Shorting esas Since you are i inverting the i input on B or i RIGHT channel You invert the B or RIGHT i channel
5. output i as well SUBWOOFER BE CERTAIN OF POWER GROUND CONNECTIONS Fig 4 SECTION 3 XLR Input Amps For consistency we suggest you use channels A and B left most 5 pin XLR for Front Left and Right and use channels C and D right most 5 pin XLR for Rear Left and Right The GFA 4304 GFA 4404 and the GFA 4702 all use balanced inputs terminated with professional 5 pin XLR connectors Each 5 pin XLR connects two channels Left and Right of signal plus a shield to the amplifier Hookup is straight forward but you must select the correct GFY adapter The following diagrams Fig 5 are a listing of all the adapters available through ADCOM for integrating any system with ADCOM car audio amplifiers and interfaces It is vital to note the APPLICATION description Specific adapters MUST be used for specific applications gt GFY ADAPTER CABLES lt APPLICATION Adapts XLR 2 ch input to accept mono RCA type input and run amp in MONO Fig 5 part 1 gt GFY ADAPTER CABLES lt continued APPLICATION Adapt XLR 2 ch input to accept stereo RCA type input and run in MONO or MoSt configuration Right channel is inverted APPLICATION Converts a 4 channel ADCOM am to a Bridged 2 channel amp via GFX 2 5 or 20 Fig 5 part 2 WIRING DIAGRAMS There are 9 wiring diagrams displayed on the following pages Six are basic single amplifier wiring schemes while one is a 2 amplifier 5 chann
6. 404 and GFA 4702 These amplifiers use 5 pin XLR type input connections In Sections 2 and 3 there are diagrams to help install ADCOM Car Audio amplifiers in the most popular configurations If a more extensive installation is required it is recommended that your authorized ADCOM Car Audio dealer perform the installation Technical support is available in our Customer Service department by calling 908 390 1130 9am to 5pm EST SECTION 1 Common Features UNPACKING Below is a list of what is included with each model amplifier GFA 4302 and GFA 4402 GFA 4304 and GFA 4404 1 Amplifier 1 Amplifier 1 Owner s Manual 1 Owner s Manual 1 Warranty Card 1 Warranty Card 1 In Line Fuse Holder 1 In Line Fuse Holder 2 RCA Shorting Plugs 2 GFY 4 XLR RCA Adapters GFA 4702 Amp Section GFA 4702 Power Supply 1 Amplifier Section 1 Power Supply Section 1 Owner s manual 1 Warranty Card 1 GFY 4 XLR RCA Adapter 1 GFC 1 Power Cable If anything is missing from your carton please contact your dealer or call us directly Be sure to verify that the serial number printed on the bottom of the amplifier is the same as the serial number on the carton If either number is missing or altered you shouid contact ADCOM immediately at 908 390 1130 Before each ADCOM Car Amplifier leaves our facility in New Jersey it is carefully inspected for physical imperfections and electrical performance as a routine part of ADCOM s Quality Assurance system This is
7. ADEM a CAR AUDIO AMPLIFIERS OWNER S MANUAL GFA 4302 GFA 4402 GFA 4304 GFA 4404 GFA 4702 IMPORTANT Be sure to connect the POWER and GROUND correctly Warranty will be affected if the amplifier is incorrectly connected INSTALLATION ADVISORY Clipped strands of power or speaker wire could enter the amplifier through the Free Flow perforated sleeve Be sure to clip wires well away from the amplifier to avoid this possibility Features and specifications subject to change without notice ADCOM Car Audio is a registered trademark of ADCOM All rights reserved 1994 ADCOM Inc gt AOWNER S ADCOM MANUAL Congratulations And thank you for choosing ADCOM Car Audio Amplifiers for your mobile sound system Your ADCOM Car Audio Amplifier uses superior engineering principles and the highest quality components to provide a musical experience with clarity and dynamics never before achieved in a vehicle PLEASE read this manual entirely before attempting to install this product Due to the sophisticated nature of this equipment we highly recommend using an authorized ADCOM Car Audio Dealer to achieve the maximum performance from your mobile sound system Your warranty is affected if you choose to install your ADCOM amplifier yourself You will only receive all the benefits of the limited warranty if the amplifier is professionally installed by an authorized ADCOM Car Audio Dealer Please refer to your warranty ca
8. el configuration using a GFA 4600 crossover interface Two are GFA 4702 wiring schemes including the power cable connections There are many more possibilities using ADCOM car audio amplifiers but these are the most widely used configurations Remember the MoSt configuration may be combined with any other diagram to utilize the full potential of ADCOM car audio amplifiers If you have any questions or confusion regarding these diagrams PLEASE contact an authorized ADCOM Car Audio Dealer or ADCOM Customer Service for technical assistance A listing of the diagrams follows Fig 6 4 channels Stereo with GFI 4400 Fig 7 4 channels Stereo without GFI 4400 or GFI 4600 Fig 8 3 channels 2 channels Stereo 1 channel Mono with GFI 4600 Fig 9 3 channels 2 channels Stereo 1 channel Mono without GF1 4400 or GFI 4600 Fig 10 2 channels Stereo with GFI 4600 Fig 11 2 channels Stereo without GFI 4400 or GFI 4600 Fig 12 5 channel 2 amp XLR 4 channel and RCA 2 channel with GFl 4600 Fig 13 2 channel Stereo GFA 4702 without GFI 4400 or GFI 4400 Fig 14 1 channel Mono GFA 4702 with GFI 4600 Front Rear Stereo 4 Ch with GF1 4400 EE pe SES ES TE PEE OE aii Tolelslelesele eyelets n GFX 2 5 or 20 2V l Rear C D L Front R Rear Front A B L Front R Rear R Front L Rear A Front L Rear BE CERTAIN OF POWER GROUND CONNECTIONS Fig 6 Front Rear Stereo 4 Ch without_GFI 4400 G 12V L Fr
9. mplifiers are designed to be used with 12 Volt negative ground vehicles The first step is to disconnect the Ground battery terminal The positive and negative gold plated power connectors on the amplifier will accommodate up to GAWG wire 8AWG cabie is the standard gauge and will fit with the insulation into the power connectors If more than one amp is being installed use 4AWG from the battery to a power distribution block Run BAWG from the distribution block to each amplifier All ground connections should be as short as practically possible and terminated at the same location A fuse or protection device MUST be in the 12 Volt power cable within 18 of the battery It should also be readily accessible An additional fuse holder may be located within 18 of the amplifier or power distribution block The fuse near the battery is to protect your vehicle An optional fuse near the amplifier is to help protect the amplifier When a fuse blows replace ONLY with an identical amperage fuse Connect the IGN terminal on the amplifier to the source unit s power antenna remote or amp turn on lead When the source is turned on it supplies 12 volts to the IGN which turns the amplifier on If two or more components are being turned on by the remote lead it is suggested to relay the turn on see Fig 1 Here the relay Bosch 0 322 204 150 or P amp B VF4 45F11 is triggered by the remote lead which sends current to the IGN connections This i
10. nstrument and it will provide you with many years of musical enjoyment If you experience any problems with your ADCOM Car Audio amplifier please contact your local authorized dealer or call ADCOM Customer Service at 908 390 1130 between 9am and 5pm EST Ask for Technical Assistance for car audio SECTION 2 RCA Input Amps INPUT SECTION it may seem unusual to find 4 RCA inputs on a 2 channel amplifier but that is just what you will find when you inspect the ADCOM GFA 4302 or GFA 4402 amplifiers Channel A is the LEFT and channel B is the RIGHT The inputs on the left side are the positive inputs and the inputs on the right side are the negative inputs If you wish fo run these amplifiers in the Balanced mode it is strongly suggested that an authorized ADCOM Car Audio dealer handle this installation There are two ways to run RCAs into these amplifiers For stereo operation RCAs connect to the left most input jacks labeled A and B When using the amplifier in either a bridged Mono or MoSt configuration the upper left and lower right inputs labeled A and B are used Always insert the included RCA Shorting Plugs into unused RCA inputs WIRING DIAGRAMS There are 3 basic wiring schemes for the GFA 4302 and GFA 4402 they are as follows 1 Stereo 2 Mono 3 MoSt Mono Stereo simultaneously In the Stereo _ mode the RCA interconnect cables connect to the Amplifier as follows The left
11. ont L Front R Froni R Front GFA 4304 or GFA 4404 R Rear R Rear L Rear L Rear Rear L R Rear SP Front A B BE CERTAIN OF POWER GROUND CONNECTIONS Fig 7 Front Stereo Mono Sub 3 Ch with GFI 4600 Remote Lead The jumper for Sub R is changed to invert the Level Left Right A B L Front SUB L Front SUB R Front R Front BE CERTAIN OF POWER GROUND CONNECTIONS Fig 8 Front Stereo Mono Sub 3 Ch without GFI 4600 Power Antenna or from crossover G fa lole fetofet of of ejeleze E ur 12V Ign L Front SUB L Front SUB Front A B R Front GFY 4 R Front BE CERTAIN OF POWER GROUND CONNECTIONS Fig 9 Stereo 2 Ch with GFl 4600 Displayed as a Stereo Mids Highs amp Can be used as Stereo Subwoofer amp also Invert jumper for Sub R if Sub Amp is Mono if stereo don t invert munnunccnneennanansasennensonvensrsnespiMnennnsarerehnahineninascrcenes 1stasastSasenasecennteritisiAAMAseREenrerneansrssnmascssonesnsausnsae a GFX 2 5 Dorae Pe ee rr Re Wid ld hb s or 20 H w G s 12V Ign so eT LEFT RIGHT LEFT RIGHT BE CERTAIN OF POWER GROUND CONNECTIONS Fig 10 Stereo 2 Ch without GFI 4600 BE CERTAIN OF POWER GROUND CONNECTIONS Fig 11 Multi Amp System using XLR and RCA with GF1 4600 A and B inputs used s
12. rd for further details GFA 4302 GFA 4402 GFA 4304 GFA 4404 GFA 4702 Power Output 30 W Ch 20 W Ch 40 WICh 70 WICh 2Ohms Stereo lt 0 25 THD lt 0 25 THD lt 0 25 THD lt 0 25 THD lt 0 2 THD 40hms Mono lt 0 25 THD lt 0 25 THD lt 0 25 THD lt 0 25 THD _ lt 0 2 THD Frequency OHz 50KHz OHz 50KHz OHz SOKHz Response 0dB 3dB 0dB 3dB 0dB 3dB 0dB 3dB 0dB 3dB Power OHz 50KHz OHZ 5UKHZ QHZ SOKHZ OHz SOKHz Bandwidth 0dB 3dB 0dB 3dB 0dB 3dB 0dB 3dB 0d8 3dB Input Impedance a5KOhms a5kOhms askOhms 85KOhms 8 5 K Ohms Input Sensitivity 400mV to 2v 400mV to 2V 60OMV to 2V Separation gt 90 dB gt 90 dB S N Ratio 2100 u5 gt 100 dB Damping Factor aso s o o eo idle Current 3 Amps 10 Amps Fuse Size 20 Amp 50 Amp 50 Amp Weight 8 Ibs 3 7kg 10 Ibs 4 6kg 12 Ibs 5 5kg 19 lbs 8 7kg 32 Ibs 14 6kg Dimensions 9 75x10 75x2 3 9 75x12 76x2 2 9 75x14 75x2 3 9 75x24 25x2 3 9 75x24 25x2 3 in inches WxLxH WxLxH WxLxH WxLxH 9 75x15 5x2 3 THD Ratings measured between 20Hz and 20khz HOW TO USE THIS MANUAL This manual is divided into three distinct sections Section 1 Common features instructions and connections for all ADCOM Car Audio amplifiers Section 2 Installation instructions for the GFA 4302 and GFA 4402 These amplifiers use RCA type input connections Section 3 Installation instructions for the GFA 4304 GFA 4
13. s considered a good installation technique and a SPDT relay is readily available from most installation shops From source unit s Power Antenna or Remote lead To IGN or Turn On terminal of all Amplifiers GFis and processors To constant 12 Volts B or power distribution block Fig 1 Chassis Ground 86 30 SPEAKER CONNECTIONS ADCOM uses gold plated speaker connectors that will accommodate up to 8AWG speaker wire Standard speaker wire gauge is 12AWG to 16AWG and will fit easily into the terminals Be sure there are no frayed or loose wire strands that may end up touching other wires Speaker polarity is clearly marked special attention must be taken while connecting speakers Speaker polarity is essential to proper amplifier operation Any number of speakers may be used with your ADCOM Car Audio amplifier The system impedance is dependent on the wiring configuration and selection of speakers Although ADCOM amplifiers are stable into loads of less than Q continuous operation into impedances lower than 2 Q may eventually lead to thermal overload causing the amplifier to shut down until it cools off Your authorized ADCOM Car Audio dealer is best able to maximize the performance of your system by calculating impedance and ensuring the proper connection of all system components MoSt CONFIGURATION ADCOM Car Audio amplifiers are capable of running stereo and mono
14. to ensure flawless performance and appearance when you receive it After you have unpacked your amplifier inspect it for physical damage In the unlikely event that damage has occurred during shipping a freight claim to cover shipping damage can be initiated THE RIGHT A TO CLAIM AGAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NOT NOTIFIED PROMPTLY AND IF THE SHIPPING CARTON AND PACKING MATERIAL ARE NOT AVAILABLE FOR INSPECTION SAVE ALL PACKING MATERIAL UNTIL THE CLAIM HAS BEEN SETTLED MOUNTING Ail audio components in a vehicle should be securely mounted as they could become airborne in the event of a collision Serious injury could occur ADCOM Car Audio amplifiers may be mounted almost anywhere every model is fan cooled so mounting possibilities are limited only by your imagination Follow these simple guidelines to ensure long life cosmetic integrity and sonic dependability 1 Always securely mount the component to a flat surface using all mounting holes 2 Never mount an audio component where loose objects can come in contact with it 3 Never mount an amplifier under a rug mat or carpet Remember the better the ventilation the less chance your amp will thermally shut down When mounting do not use the amplifier as a drilling template Use as a marking template only When mounting an amplifier use only Pan Head screws not beveled head and DO NOT OVER TIGHTEN Pan Head Screw lt p CONNECTING POWER ADCOM a
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