hey everyone i put in a eclipse indash monitor and in dash 6cd changer in my lex and it gives that feedback noise when the engine revs...i bought noise filters and put them in...the noise cancelled on the front speakers but not the rear....any ideas what the problem is and how to fix it? thanks to anyone and everyone who can help me out on this....the whine is pissing me off haha
Mike

 

Definitely not an expert in the subject mater but of the top of my head I say it is a grounding problem.

Check all of your grounds.
Make sure you are grounding to a good bare place on the chassis of the car.
Keep all Amps grounded to the same spot with a minimum cable length and also at least the same gage as the power.

Hope that helps.