Question about Car Amplifiers
I had infinity speakers in my car when I bought it, but the amp was taken out. I put an amp in yesterday and cannot get rid of a high pitched whine through the speakers only when the car is on. I also had typical alternator whine but found that be from a bad ground (it's fixed now). Here's the situation, if the cars on and running I have the whine. When I unplug the two rca's for the front speakers from the amp the whining goes away, same for when I unplug just the rear rca's. If three or more are plugged in the whining returns. Any suggestions on how to get rid of it because I haven't found any.
The shield ground is probably open in the head unit. You can check the shield ground by measuring the resistance from the shield of the RCA connector to the chassis of the head unit. It should be near 0 ohms. Disconnect all RCA cables from the head unit before testing.
If you find that the shield ground is indeed open, the following link has more information for a temporary fix.
Temporary Shield Ground Repair
Posted on Nov 18, 2007
Get some good rca cables.I had the same problem with cheap wiring. So I went out and bought high-end rca cables. They cost me 40 bucks but it stoped all my noise.
Posted on May 19, 2009
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