Ok guys here is the full version....

I bought 6.5 polk momo components for the front, 6x9 for rear, and eclipse amp to power them. After the install i drive off no problem. Later that night i start noticing a little whining noise when the volum is very low. The next day, i turn the car on and all I get is a loud a** whining noise through all the speakers.

I take it back to the shop that did the install and they said one of the speakers was defective so they changed it for free and once again I drive off w/no problems...

Later that night that sound start coming back under load (gets loader when i accelerate in 1st 2nd and 3rd) and at low volume...So I take it back again and this time they tell me the door speakers are too big and they are grounding out against the door. So I negotiate with em and get a $600 pair of smaller MB Quart components as a replacement

The install on those mb quarts was done today and now that noise is coming back under load

I'm takin this crap back to them again but just wondering what u guys think it might be.....bad ground, blown rca outputs on headunit??? Any ideas are welcome

 

The noise that you are hearing is an Alternator noise that can be caused by a bad ground on the amp. When they run your RCA jacks make sure that it is on the opposite side of the power supply for your amp.

 

Keep me updated on what happens.
TIA

 

Re-ground the amp and deck!!!! The speakers themselves shouldnt be defective because of alternator feedback

 

This sounds dumb was were the ground for the deck? If i rember right it is behind the deck correct?

 

Its the black wire(should be) instead of using the factory ground make your own ground somewhere behind the deck

 

The noise stopped today, if it starts up again then I'll check the ground on the amp. The deck ground should be fine, I had it in the car for almost a yr w/o any problems.