I have noticed that when playing pl2z or really any other matrix surround modes on my denon avr-790 that most of the sound is coming from center channel never seemed correct to me. then i repositioned my front speakers and all of a sudden it started adding in surround effect much more and more to the FL and FR speakers. I dont know if moving the speakers bumped some connections on the rear of reciever or what ben reconnecting speakers at amp and messing with analog inputs but cannot figure it out it only played this way for two days and now it has gone back to mainly center channel.
It almost seems like when you have that old car stereo and the sound gets cut out and you have to turn volume way up and it finally kicks back in like its being choked and it breaks thru. Dont know if any of you have experienced this I have on an alpine cassete car stereo reciever and a stock chevy radio both circa 1990