Re: Speaker Help
I'm with Knowmadic on this.. You pay for an install,.. it needs to be right. End of story. I wouldn't have left the place with the noise,.. which is part of the reason I install myself,.. but also because install prices are so outrageous most of the time.
But for troubleshooting.. this has pretty much been said already -- But I'd swap the RCA's from front and rear.. See if the noise follows the RCA cable,.. or stays on the same channel. If it follows the RCA cable that is moved, then it's likely the cable. If not.. it's Amp, Speakers, or Wiring of course.
A ground loop eliminator would likely get rid of the noise ($5-$15) , but doesn't solve the underlying problem.
Bottom line, take it back.. don't be a jerk.. but be firm enough to not let the store get away with noise in the system. Even if they have to put new parts in.. it's their problem not yours.
I don't know the situation with your parts -- If you brought your own amp, and they put in other parts... they will try to blame any part that is *yours*.. Call them on it,.. tell them the amp was fine before it was installed (if it was yours).. and to test it with one of their amps. If their amp is clean, they just figured out the problem for you. If you bought ALL the stuff from them, cheap or not.. It needs to be 100% perfect and noise free.. no if, ands, or but's..
Vehicle: 2008 350Z
Headunit: Kenwood DDX-470 - Front Stage: JBL 6.5" MS62C Components - Rear: (1998 German) MB Quart 6.5" QM-160-KX - Sub: SRQ Custom Enclosure with JL Audio 10" W0v3-4 @ 300w RMS - Amp: 5-Channel PPI 900.5 - Wiring: KnuKonceptz 4g Power/Ground + 3 Sets Twisted Pair RCA's - 14g Speaker wire - NVX + Rattletrap Extreme Sound Dampner (30Sq ft.) Throughout - Extras: Rear/Reverse Camera - KCA-iP-202 w/ Garmin Navigation Integrated with Touchscreen.