Okay, to start, Ive had 2 kenwood subs and amp in my car running off of a KDC-135 HU and its always worked perfectly. Recently I added 4 JBL door speakers and 2 Tweeters, everything worked fine running off the HU, besides not getting enough power. When adding the new amp for the door speakers, I get whine when my car is running, it increases with RPM of the engine. I have tried moving the ground to the amp, I moved the RCA cables away from the power and ground, checked the resitance on the RCA cables (0.03/4). Nothing seems to fix it. I also took a RCA to Aux cable and hooked it directly to my amp and then to my phone, and it played music without the whine. Meaning it wasnt using the HU. Could It be my HU grounding? Or my Power control cable? This is the first time Ive setup audio in my car like this, the subs went in easy with no problems. Everything else was fine too, besides the whine.
1997 Subaru Outback
JBL GTO series speakers and tweeters 70W RMS
2 Kenwood 12in Subs
MB Quartz amp (80w RMSx4)
Not sure on the model for the subs/amps. I can get them if needed.
Also Im not using the stock battery, I got one of the highest rated batterys.