[edited to add a little more detail] All, I've recently been fannying round with amp setup and have made several changes. The basic setup is: - Sony dvpns900 Yamaha dsp-e800 (for all processing) Linn lk280/spark (for the front pair) 2 x lk280 (one biamping centre, one for rear) (before we even start, YES, I know I need to upgrade the e800 ) I used to have a Myryad integrated and power driving the front pair and recently changed to the 280/spark in a straight swap, tho obviously the front speakers are now single-, rather than bi-, amped. Also in the change, I had to change the cable from the e800 from a VdH 103 to a custom phono to xlr which I made myself (and not a bad job either ) Since changing over, I now get a "thump-pause-fizz" (I promise that's the exact noise!) from the front speakers whenever the e800 thinks that something changes that causes it to change its DSP. For example, a dvd playing changes from menu to movie (PL to DD maybe) or from dts intro into movie (all DTS, but with a slight pause that makes it drop into PL briefly) will cause it. Likewise changing input from dvd (PL default) to cd ("no effect" default) will cause it. Could be one of several things, but I'm lost. I was at first thinking it was a problem with the new amp because it only comes out of the front pair, but why would it happen whenever the e800 does something? And that's what's making me think it's the e800. But, how would changing the amp affect the e800? Catch 22 situation I think. OK, it could be the cables too, but they seem to be fine). Anyone got any ideas? It's driving me mad!