Hi Walt, I don't know if this has anything to do with the loud pop(google BITSTREAM BOMB) you experienced,but I've read about this before on other forums. For some reason it seems to happen with some older AVRs,pre/pros,Onkyo,Marantz,Yamaha,and maybe a few others that use the same processing chip? Problem has been reported when playing DTS-HD Master Audio movies, usually loudest pop occurs at the beginning of the end of movie. I want to say there is firmware that can be downloaded and installed on AVR's to fix the problem. Maybe someone else can add to this. Good luck on it, it may not have anything at all to do with the Epik amp section.