A whining/crackling sound is heard from my 4 speakers

[TheLinkster]

Hi

My system consists of 4 speakers, 2 tweeters, 1 subwoofer and 2 Amps.

Amp 1: Powers all the speakers + tweets.

Amp 2: Powers subwoofer.

I have a whining/crackling sound emitting from all of my speakers and tweets, but not the subwoofer.

It is quite loud and very annoying and mimmicks the engines RPM. I know that the headunit I am using is not the cause, because I had no engine noise at all before I installed the first amplifyer.

I have RCA Splitters and Y Adapters connected to my RCA Cable to achieve this setup, as the headunit I bought was quite limiting at only 2 Preouts.

I found a new ground for the first amp, properly sanded it down and whatnot, since this is the only amp that features engine noise, and I still had no luck.

I searched the forums but did not find a scenario like mine, where I have 2 amps and only 1 amp seems to have noise issues.

If anyone has experience with this help will be greatly appreciated.

Click to read more...

 

[enzowho 10+ year member]

Its a good ol' ground loop. There should be lots of information regarding them on this forum.

Basically to get you started here are some common causes (although not limited to just these)

1) Bad grounds. Ground all amps, caps, eq's etc to the same location. Insure the ground is solid, and cleaned paint, dirt, etc. Additionally, the head unit needs to be grounded to the chassis as well.

2) If you have a pioneer hu this could be the problem too. Check out the thread about grounding the RCA's.

Those two things should clean up 95% of ground loop noise issues. Give it a shot and see how things turn out.