Just installed a new in wall speaker system with a Pioneer VSX-520-k and have been thrilled with the sound quality thus far.
The problem I am running into is when I watch blu ray movies such as the recent Star Trek. I set the receiver to auto surround to detect the codec, but what happens is that the receiver will turn itself off (protection mode) when a loud sound effect (explosion or loud clang of metal) happens. quiet scenes at high volume are fine, but the action sequences seem to do something to the receiver to make it give up the ghost.
I have confirmed that one of the speakers is bad, and have disconnected it (but still have the same problem). I am going to try putting the receiver in 5 channel stereo to see if I can replicate the problem, but I am honesty baffled by this one.