I recently bought a JVC EXAD head unit to replace my old Panasonic CQ-C5210U. I replaced it because I was getting a faint static "shhhh". It was audible at low levels, but was easily covered up at higher levels. I replaced the head unit and at the same time added a component set. Now the shhh is enhanced because of the tweeters. I have run the speakers of BOTH the headunit, and an external amp, and I'd done the same with the last headunit. Therefore, I'm pretty sure I can rule out the headunit as the culprit, but I don't know what else to do to get rid of the noise. Anyone have any suggestions?