I got the strangest pop from my HC setup yesterday when I played Joe Satriani's Live in San Francisco dvd. The pop from the speakers occurred exactly when the transition of two channel stereo (menu section) kicked into DD 5.1 for the film. I did notice it did not happen again if the audio track is selected for DD 5.1 first. This problem seems to specific to this dvd disc only as I have tried it out with other discs. Is this normal or something broke on the amp? My setup is Marantz SR6300 with MS Premiere speaker pack and Sony DVP725D. Cheers.