Hi - anyone got any ideas ?!? Recently moved some M/K speakers from "sides" to "rears" on Lexicon Processor - getting a loud popping noise in the right rear channel when powering up/off or trying to calibrate the levels or changing modes - this only lasts for the initial change but sounds like fireworks! When changed back to sides there is no popping sound ?? Fault with the rear channels of the processor ??? Thanks in anticipation !