adulbrich 5,000+ posts Olive oil un-virginer 14,433 123 Ames, Iowa Jan 19, 2015 #16 Maybe alternator wine then?
keep_hope_alive Premium Member Acoustics Engineer 7,516 91 Quad Cities, IL Jan 19, 2015 #17 if the hiss varies with engine speed, then it's either because the amps are mounted to metal or the typical Pioneer alternator whine issue (or both). that noise is caused by a ground loop and Pioneer head units are succeptable to this noise.
if the hiss varies with engine speed, then it's either because the amps are mounted to metal or the typical Pioneer alternator whine issue (or both). that noise is caused by a ground loop and Pioneer head units are succeptable to this noise.