We have a Yamaha RX-V450 receiver and the sources are a Pioneer DVD player and a digital satellite decoder. When I listen to a CD, and select PLII/Music, I hear sound out of all five speakers. So there is no problem with PLII and CDs. However, when it comes to the broadcast signals, sound comes out of only the centre speaker. Every other speaker emits a weird, garbled, incomprehensible sound. My decoder is connected to the amp via RCA leads. I have only tried channels where there is clearly a stereo signal to begin with. Could the problem be that it is not a digital signal coming from the decoder? Or is it that there is no hidden info in the stereo signal that is received? Any advice would be much appreciated.