Hi guys, recently I have re-configured a car sound system. However, I did notice there is a hissing sound. Tell me what is that ?

that is so called aeroplane sound or 'turbo' sound... there's a thread about it here in ICE. Usually cos by lousy equipment or bad wiring.

err ... it's not the turbo or aeroplane sound ...
if turbo/aeroplane sound means when we accelerate more, the sound will drag longer and higher.
But this is just a hissing sound only. If we accelerate, nothing happen. Just a normal hissing sound.

ur amp gain set too high up

its called floor noise...

like loon said either your amp gain is too high... or its from the chain link before the amp... guide us through the system if you can...

cheers...

He is right. It can be due to high gain. I faced the same prob. I bought the isolator, and the hissing/turbo sound reduced dramatically. Still got la, but not much.

The reason for the hissing also may due to bad wiring, interference and many more.

better change the equipments to settle this prob..it's not a good idea to use isolator..that's why u cant see them in my shop...hahahah

since when i change name?

hehe... sorry sorry... thought it was loon... jus woke up that time...

Ur hissing sound might be high distortion in some part of ur system. Hissing will get louder in higher volume.

Its grounding problem. Send back to the workshop to check wiring.
I had the same problem before.