Well i have had this pioneer headunit in my car for about two years with my stock bose system and now i have upgraded my system 4 channel amp component speakers sub and sub amp and im getting static noise coming out of the speakers. I heard these pioneer headunits blow a pico fuse so i opened it up and did not find it could this be the problem. I have a DEH-P510UB pioneer headunit any one here with this headunit have this static noise problem or found the pico fuse. by the way i tryed grounding the rca's on the headunit and it did not work actually made it worse.