Okay guys I have had this problem for close to year now and I am about ready to pull my amp out and run off of hu power again I am so fed up... its that serious... lol. I drive a 2003 grand am. I have 0awg big 3. 0awg from front batt to rear batt. My mono amp and highs amp both have independant power wires that run to the rear batt. Both have independant ground wires that run the batt also. And then the batt is grounded to the rear strut tower. All connections are solid... soldered terminals, sanded surfaces to the metal and all...however, I am experiencing what I expect is engine noise coming from my rear speakers. Tone changes with rpm level, blinkers make noise thru the rear speakers as well. My highs amp is a fosgate 400-4. So not top of the line but by no means a cheapie. I have a pioneer premier 4volt hu paired with a soundstream 7band eq and line driver. Let it be known also, noise is only generated thru the rear speakers which are amplified by the 400-4. The front speakers run off hu power and do not generate the noise. I have redid all grounds. Replaced all wires. My power is ran on drivers side. And rcas and remote ran on passenger. Ground loop isolaters have no effect. Does anyone have any idea what else I could try to grt rid of this horrible whining
Any help at all would be greatly appretiated.