I've got a problem and i think i prob know the answer but anyway. My centre speaker has developed a hiss. When any sound is decoded to it (from dvd player) it hisses. Between scene changes it disappears (like at the beginning of a dvd when you can 'hear' sound dropout as none is being sent or decoded during the advert changes). Initial though was speaker knackered. However i plugges the rear speaker into the binding post for the centre and that too started to hiss. change everything back and the rear stops hissing and the centre starts again. That obviously points to whatever is coming out of the binding posts is at fault. Anyone know what the problem is with this channel??? i.e what causes a hiss (there is still speech and sound present but a hiss is also present). Is there some sort of component in each channel in the amp that shields interference? maybe this is knackered??