mmdir2002@yahoo.co.uk wrote:
> I got a x-mas present, a 500W amp. I installed as two channels
> amp in rear of my car. I hear a noise like a hissing. It's constant
> hissing sound no matter which volum I play the car audio.
> I did check out the all the wire. I'm not sure if the hissing
> is coming from the car stereo or from the new amp. Is there way
> to filter out the hissing noise?

if it's constant volume, it's not the fault of the existing stereo. if
it's affected by engine rpm, or goes away when the engine's not running,
it's picking up noise from the power supply. that's fixable, but at
additional cost. if not power supply noise, disconnect the input at the
amp end - if hissing is still present, it's definitely the amp. if it
goes away, obviously, the amp's ok so it's noise pickup from the cables
that run from the existing stereo to the amp. your only option then is
screened cable. chances are, you're already using that.