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Symptom | Diagnosis | Remedy | |||||
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Amplifier Noise | Voltage spike from remote | Use a different 12 volt source for | |||||
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| REM lead of amplifier (i.e., battery | |||||
| through REM input terminal. | direct). If noise is eliminated, use a | |||||
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| relay to isolate amplifier from noisy | |||||
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Engine Noise | Noise is radiating into RCA | Check connections, run the RCA | |||||
signal cable. | cables on a different route away | ||||||
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| from sources of high current. | |||||
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| Bad component in the signal | Check connections, bypass addi- | |||||
| chain. | tional components (crossovers and | |||||
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| equalizers) between the source unit | |||||
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| and the amplifier. Connect one | |||||
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| component at a time to determine | |||||
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| the culprit. Repair or replace com- | |||||
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| ponents as necessary. | |||||
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| Noise is radiating into speaker | Disconnect existing speakers and | |||||
| cables. | connect a test speaker to the output | |||||
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| terminals of the amplifier. If noise is | |||||
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| gone, reroute the speaker cables | |||||
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| away from sources of high voltage. | |||||
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| Multiple grounds in the | Check ground connections and | |||||
| audio system. | connect amplifiers, signal proces- | |||||
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| sors, and other components to a | |||||
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| central location or try a different | |||||
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| grounding point on the chassis. | |||||
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| Ground loop between source | Check connections, disconnect | |||||
| unit and antenna. | antenna from source unit. If noise is | |||||
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| gone, install an antenna ground | |||||
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| loop isolator. | |||||
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Engine Noise when | TOPAZ input circuitry (in Rock- | Supply reference ground to the | |||||
using high level | ford amps) or floating input | TOPAZ input circuit (or floating in- | |||||
inputs | circuitry (in | put circuit in | |||||
| amps) does not have refer- | Connect shield of RCA input from | |||||
| ence to “chassis ground.” This | auxiliary amp to chassis ground of | |||||
| noise, if any, occurs at the | radio. An alternative method is to | |||||
| auxiliary amplifier whose in- | connect the RCA shield to the | |||||
| puts are fed from the pass- | amplifier's power ground terminal. | |||||
| thru output of the first amp. |
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• If noise persists, see your Authorized Rockford Fosgate Dealer.
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