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Make sure the pin jumpers are all in the same position (all are high, or all ere tow). Connecting other brands of Balanced Equipment As more and more manufacturers are realizing the benefits of using balanced lines in the car audio environment, more processors, EQs, crossovers and even head units with balanced line capabilities have become available. As there is no standard in the industry for balanced line signals, the connectors and wiring configuration can vary greatly from brand to brand. Compatibility among different brands of true balanced line components is possible. Whenever compatibility is in question, consult the other manufacturer and Adcom to determine the steps needed to match components. Fig. 7 shows the wiring diagram for XLR pin configuration in Adcom components. Multi Amp System with GFI*4600 using a GFY-2B SPECIAL NOTE ON GFI-4600: Make sure all of the Polarity Pin Jumpers are in the SAME position. There Is no need to Invert polarity for the 5000-Series Amps. G G I 92;3fm** I □□ <151 mason) L R* A_ i is [51 n— O lr »wyntm'iSr ♦ h—i< . ♦ »liT I ""HI aiDDannnnnnnn L Front— L Front + ■ R Front+ ■ R Front — Fig. 9 Dual GFl-4600 / 2-channel 3-wav system © G ll02.7fM «l □□ l 0S0GB SPECIAL NOTE ON GFl-4600; Make turn all pf the Polarity Pin Jumper* art In (he SAME position. There Is no need to invert polarity for the 5000-Serie* Adcom Amp*. 9 GFl-4600 c GFl-4600 .SiiS. SUP. — .L 4 4. JL S. k, *. A. S- 4 -fit Front Sts A® C/O 0 r Front Sue A/8 C/O 0 - Ttnms MM. Bin L—€$ SubWoofen 100Hz&down Mld-8«*»: 100Hz to tOOHz Mlds/Hlght: 600Hz & up TROUBLESHOOTING It is beyond the scope of this manual to be able to cover all problems and solutions. If this table does not help to solve the problem, contact your dealer or the Adcom Technical Service Department for further advice. Since the 8alanced Line system eliminates induced engine noise and ground-ioop potentials between the GFl-5200 and the amplifier, engine noise problems can usually be tracked down to the component(s) prior to the GFI unit. You will need 4 RCA "shorting plugs" and an ohmmeter (or continuity tester) for some operations. SYMPTOM PROBABLE CAUSH(S) POSSIBLE SOLUTION Alternator Whine \' i 4-Ground loop. ❖Noise is entering through power wires of head unit. ❖Disconnect RCA inputs to the GFI-5400 and plug the shorting plugs into the GFI inputs. If the noise remains, contact your Adcom Dealer or Adcom. ❖If the noise goes away, the problem is not in the Balanced System and is probably 'upstream* of the GFI. Try a ‘Noise Filter' on the power and/or the memory lead of the upstream units. Loud I squealing noise ❖Loss of a signal-ground ❖Check to make sure all signal connections are tight. ❖Disconnect everything and re-connect it ONE component or cable at a time. Turn the system on after each new connection. When noise appears, the item iust added is the culprit. I No Bass or Weak Bass ❖One speaker or channel is out*of-phase ❖Check speaker wire connections (both ends). Make sure V toto ■*'. ❖If you are using a GFI-4600; make sure no polarity jumpers are out of phase. Amplifier "Thermals" Easily ❖Shorted speaker wire. ❖Load is too low. ❖Amp is mounted, incorrectly. ❖Check speaker wires for shorts between leads, or shorts to ground. . ❖Disconnect speakers and measure DC resistance of speakers leads. ❖Make sure fan is not obstructed, or amp Is not in too small of a space. No Sound. No LEDs lit in amp. ❖Loss of power to amp ❖Check PWR, GND and especially REM connections. . ❖Check all fuses. No Sound. All LEDs are lit in amp. ❖Signal not reaching amp. ❖Loose speaker connections. ❖Check signal path from head unit to amp. ❖Check speakers, speaker wire and connections for integrity and continuity. No Sound. 1 Red & 1 green I LED lit in amp. ❖ Thermal shutdown ❖ Fault. ❖Let amp cool. It will reset. ❖Contact your Adcom Dealer or Adcom Technical Service Dept. SPECIFICATIONS: specification G FA-5225 GFA-5250 GFA-5275 4ft output, both 25 Watts X 2 50 Watts X 2 75 Watts X 2 channels driven Typically Typically Typically <0.075% THD <0.075% THD <0.075% THD 2ft Output, both 50 Watts X 2 90 Watts X 2 150 Watts x 2 channels driven Typically <0.075% THD Typically <0.075% THD Typically <0.075% THD 4ft Output 100 Watts 180 Watts 30Q Watts MONO Typically <0.075% THD Typically <0.075% THD Typically <0.075% THD Frequency 5Hz-20kHz 5Hz*20kHz 5Hz-20kHz Response +0dB,-1dB +0dB, -1dB +0dB, -1dB S/N ("A" weight) > 100 dB > 100 dB > 100 dB - input 13.8kft 13.8kft 13.8kft . Impedence Balanced Balanced Balanced input 875mV for Rated 875mV for Rated 875mV for Rated Sensitivity 220mV with GFI 220mV with GFI 220mV with GFI Power Supply ,000 ,000 .000 Capacitence uF uF uF Operating 10 Vdcto 10 Vdcto 10 Vdc to Voltage ' 15 Vdc 15 Vdc 15 Vdc Idle Current Amps Amps Amps Fuse Size 20 Amp ATC 25 Amp ATC 30 Amp ATC Net Weight lbs ( kg) lbs ( kg) 8lbs(3.6koV . Shipping Weight- 8 lbs (3.7kg) 8 lbs (3.7kg) / 10 lbs (4.6kg...

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