Question about Pioneer DEH-P3900MP CD Player

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RCA Pre-Out Making Producing a Mumming and a Popping Sound.

The unit sounded o.k. for during the first six months of use. Just recently, mostly when I first start the car the subwoofers connected to the amp starts to hum and pop in a rhytum. I tried new RCA cables but that didn't work. I have a 2002 Nissian Altima. The humming sounds simular to ground loop, but my ground cables to the amp are of proper gage and are no longer than 20 inches. Is it because of the negative ground factory speakers that came with the car ?

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If you have this humming sound, try to ground the rca to your car body ground. that will do the trick...

Posted on Jul 11, 2008

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The speakers hook to speaker wires not to any thing else no power no negative poles do you have a remote shut off switch connected to amp this would be important to cut off amp

when cut off amp if you still here the humming this can be an indicator of low power being produced by alternator alternators produce 14 anything below 12 would mean replacement of alternator

if alternator fine then you need to find new ground for amp and make sure you have a good ground for sterio this can be checked with a test light
to check a ground all you do is hook gator clip to power then touch test light end to ground on radio end light comes on got a good ground (make sure not to touch any other sterio wires just the ground wire while connected to power to check grounds)
if pulsing in test light on the ground means you have a bad ground
just disconnect move to better ground

check the amp ground the same way as decribed above

Posted on May 09, 2008

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