I figured if it was a bad speaker that it would provide the error in any listening mode (when listening in 5.1 if it was center or surrounds) or in stereo mode if it was one of the fronts.

I find it odd that it only happens when in "multichannel stereo" mode.

Either way, I think the idea of swapping speakers or adding one at a time is the best idea to try and determine if it is a speaker.


-David