I have a Marantz SR6300 reciever. It sometimes (once or twice during regular movie) produces noisy aditional sound. Sometimes it is of higher frequency, sometimes lower. It always happened when listening in dolby digital sound. Never when using DTS, or analog inputs. The additional sound is annoying but I think also dangerous for the speakers, since generally it is much louder than the original "background" sound in the movie. Has anyone experienced something simmilar? Any clues?
I have already switched the DVD player (so this could not be the reason), and also have tried both optical and coaxial cable (so this is also not the source of the problem). I suspect the dolby decoder in receiver is malfunctioned, but would like to hear the oppinion from the others.