Anybody know why I occasionally get this annoying, loud "popping" or "clucking" sound in the rear speakers on a Kenwood Wireless Rear Speaker system? I acquired this some years back, and the receiver is a Kenwood RFU-R6100.... there is a transmitter attached by wire to my sound system receiver, and teh Kenwood receiver is connected by speaker wire to the 2 rear speakers. It doesn't seem to happen all the time, just occasionally when I'm playing Dolby Digital 5.1 material (or DTS-HD in the case of Blu-Ray) ..... not quite sure what could be causing this? There are a LOT of wires in the area where the Kenwood receiver connects to the speakers, none of them really related to my stereo system - but that was always the case, even when I first acquired the wireless rear speaker system. This "popping" sound from the rear speakers has only been occurring for about a year or so ..... Any input on how to correct this would be greatly appreciated.