i just upgraded my deck from a pioneer deh p7200 to the 7500 series(gota have mp3 ) and after installing it today i hear a slight hissing sound in the backround when its on, which never happened when i was using the 7200. I was using a nameless brand deck before switching to the pioneers that made the simmilar sound, but i thought it was because of the cheap quality. I dont know much about audio hopefully one of you guys could help me out? thanks...

 

Are you listening to Mp3s, Radio, or Bootleg Cds?

 

i pretty much hear it everytime while litening to mp3's, radaio, or cd's

 

Probably just the deck. Pioneer audio components (car and home) tend to be noisy.

not a Pioneer fan.

 

Properly grounded?

 

If you are using amps, reset your gain. Make sure the EQ-EX feature is not turned on. Any big boost on treble will make hiss.