My back speaker whine problems

[psychotic]

Ok so I have the ground-loop whine in my rear speakers (with the pitch that goes up with the RPMs b/c of the altenator)

I want to try and fix this without installing a ground-loop isolator.
Yes the power wire and RCA cables are run down opposite sides.
Here is what i've tried:
I've switched the front and back RCA cables to make sure the whine didn't come from the RCA cables. (because it is only in the back speakers)
-- still whined so it wasn't in the RCA signal

I also just now switched grounding locations for the front and rear amp. The rear still whines, but the front does not.
-- so the grounding spot isn't bad I guess?


The front amplifier pulls more amps than the rear one(25 amp vs 40 amp), if that makes any difference as to why one whines and one doesn't.

I also have another amplifier for my subs pulling 60 amps grounded a couple feet away from both.

Would putting 0 ga wire from the negative battery terminal to the frame help? This is the only other thing I can really think of.... to help make the ground better.

Any ideas??

 

[Black Magic]

I have an O guage ground strap from the Negative to the frame. However, I don't know if it would help your whine or not. But It does help keep good electronics.

You can see it as the far Left wire off the Negative side.

 

[Rscotts1]

As Black Majic has said, better grounding may eliminate your problem. On my X, I ran all new grounds from the battery to frame and frame to engine.

 

[Mbrooks420]

Is your RCA run down the pass. side? If so you may be picking up interference from the power wire going to the ffactory amp.

 

[psychotic]

RCAs are run down the passenger side, but I don't have a factory amp

 

[Mbrooks420]

Why not?