Well I'm stumped on this one....I have read searched this topic and tried various ways to cure it, but I can't eliminate the engine noise im getting through my front speakers. My setup is D3 to a RF Punch120 amp which powers my RF 12" Sub....no problems here. The rear door speakers (factory) are powered staight from the D3. The problem lies with RF components in front...powered by a RF 260sd.
I get all sorts of feedback through the fronts only while engine is running, and the sounds varries with the rpms of the motor. I have my rcas on one side of the car and my power wire on the ot