Originally Posted by ScottVelocity

No factory sub.

I installed a Video Link: http://www.amazon.com/Pioneer-AVH-P4300DVD-Touchscreen-TFT-LCD-Controls/dp/B005XHV2HA/ref=sr_1_415?s=car&ie=UTF8&qid=1325590452&sr=1-415 head unit in my F150 last year with a brake bypass. I also upgraded the front door speakers at the time. I had an annoying hiss/static noise in all speakers that would get louder as the volume was increased.

Fast forward to this weekend. I installed a Kenwood KAC-7005PS five channel amp, MB Quart 12" sub, and new rear door speakers.

The annoying hiss/static is still there. I've tried grounding the head unit in other locations and removed the brake bypass thinking that might be the culprit but still no luck, the noise is still there.