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?