I am driving a VIVA. my setup is as follow:
Kenwood KDC-U453 HU
Kenwood KAC-M646 500W Amp
Sony Xplod xs-GTX1620s 260W Front component + with tweeter
Original VIVA component for Rear
Brother 160W cylinder tube woofer - just buy a small woofer cause VIVA is a small car....

I have all the above purchased at Brothers.

Recently i found that the tweeter has Hisss or Titttt sound appearing in background.
The noise become obvious if the volume of song is low.
Another thing i found is that, the noise only appear when the engine is started.
I try my ICE without engine running, and no such noice appear.
The noice also increase each time i step on my fuel pedal (noise louder when engine moving harder).

Do not have such noises when i first install all the system. Now they are 2 months old.

Any1 know what is the causes of the noise?


Anyway, any recommendation or critic about the setup above? Anything i should add?