noise filter

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=19570
Printed Date: August 19, 2025 at 7:18 PM

Topic: noise filter

Posted By: ZX9R
Subject: noise filter
Date Posted: October 01, 2003 at 10:15 PM

I have a question about using rca style noise filters. I have alternator whine at low engine idle. I have removed the head unit and ran a seperate power and grd wire and a noise filter on both grd, power side of head unit. but the problem is still there. If I unplug the output rca connector from the head unit to the first amp I have and run the engine noise will go away. I installed a scosche es-034 grd isolator in the rca hook up and noise goes away but I was worried about this affecting my signal output "SOUND QUALITY" I was trying to fix the problem without messing with any of the signal wires. Any ideas would be appreciated.

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--ZX9R

Replies:

Posted By: fuseblower
Date Posted: October 02, 2003 at 8:04 AM

Have you tried new RCA cables. You could have one that is bad and creating interference with the signals.

Posted By: DYohn
Date Posted: October 02, 2003 at 9:47 AM

Yes, replace RCAs and also check for good ground on your amp. It is also possible you have a speaker wire (or a stray strand from a speaker wire) that is touching a ground between the amp and the speakers, but not too likely if the Scoche ground isolator helps.