Originally Posted by Dave06
yes Iam using a pioneer head unit DEH-P680MP
Pioneers have a know problem with grounding/noise/static/engine noise.
I have the 5700DVD and its terrible on the radio..I also have a PSD and all the alternator noise comes through my speakers...so I am forced to keep the gains way low on the amp..but not on the subs. A REALLY good source for problem solving your issues can be found at www.the12volt.com
lots of good threads there about noise with Pioneers.
Best of luck to you,