Distortion only with 2 sets of rcas in 4 channel amp
I have tried several 4 channel amps and still get the same distortion.
When only one set is hooked up there is not distortion on both sets.
But right when the second is hooked up there is tons of whining even if the car is off.
I have tried changing out rcas but same result.
Is it just my deck? Rcas are all Rockford, grounded headunit RCA outputs, and upgraded hu ground wire.
Car: Chevy Cobalt Coupe
Front Stage: Mids: Aura rpm 4", Midbass: Four Aura NS6's
Rear Fill: Pioneer 6x9s
Amps: 2 Rockford Fosgate T400-4's, and a T1500-1BDCP
Electrical: Stock 140amp alt, Big 3, and a SHURiKEN SK-BT100
Winter sub setup: Kicker F12a IB mounted from rear deck
In the works: Diamond D9 12