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Old 07-03-2005, 07:10 PM
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Engine noise from separate amp

I have run low level RCA cables from the head unit to a separate amp in the trunk of my car for an extra set of rear speakers. The battery is also in the trunk, so I hooked the power and ground leads for the amp directly to the battery posts.

Everything works fine until the engine is running, then I get a loud whine from the speakers that changes with engine speed. The whine is there even when I disconnect the RCA leads going into the amp. So, it is coming in through the power or ground wire.

Do I need to avoid connecting directly to the battery, or is there a filter I need to put in the power lead, or on some other part of the electriical system?

John

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Old 07-03-2005, 08:11 PM
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Noise

Doc here,

The engine speed whine you are experiencing is coming form your Alternator..

Get a Ferrite bear, or choke to install on your Alternator power wire, just a simple one loop thing through the bead..

You should be able to get one from radio shack, or an auto stereo store for a few bucks..

The other end of the equation is , by my best guess, your picking up RFI through your Speaker wire, and transducing that into "Noise" in the speakers.

Properly Gauge your COAXIAL <--READ speaker wires, and locate their harness as far away from power and ground harnesses as possible (like the other side of the car...)

Make SURE all your audio grounds are at the AMP end ONLY..NOT both ends..this will induce ground loops and hummimg.

Install ferrite beads on your speaker, power, and ground wires, or low pass filters to clean up all incidental noise.

Doc
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Old 07-12-2005, 10:18 PM
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i have also had the same problem with one of my amps where the ground for the RCA's broke off on circuit board inside the amp.
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