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| N |
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Symptom | Diagnosis | Remedy |
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Engine Noise | Noise is radiating into | Check connections, | and |
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| RCA signal cable. | run the RCA cables on a |
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| different route away from |
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| sources of high current. |
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| Bad component in the sig- | Checkconnections,andby- |
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| nal chain. | passadditionalcomponents |
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| (crossovers and equalizers) |
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| betweenthesourceunitand |
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| the amplifier. Connect one |
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| component at a time to de- |
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| termine the culprit. Repair |
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| or replace components as |
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| necessary. |
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| Noise is radiating into | Disconnect existing speak- |
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| speaker cables. | ers and connect a test |
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| speaker to the output ter- |
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| minals of the amplifier. If |
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| noise is gone, reroute the |
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| speaker cables away from |
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| sources of high voltage. |
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| Multiple grounds in the | Check ground connections |
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| audio system. | and connect amplifiers, sig- |
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| nal processors, and other |
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| components to a central |
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| location or try a different |
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| grounding point on | the |
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| chassis. |
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| Ground loop between | Check connections | and |
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| source unit and antenna. | disconnect antenna from |
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| source unit. If noise is gone, |
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| install an antenna ground |
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| loop isolator. |
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Engine noise with | No reference ground | Connect GND terminal of |
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high level inputs |
| high level input to chassis |
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| of source unit. |
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• If noise persists, see your Authorized Rockford Fosgate Dealer.
– 34 –