I have a Marantz SR-8300 receiver. When I listen to anything-music, tv, ect... in CS II I hear a bothersome low end bassy hum coming from my speakers. This sound is especially bothersome the moment I switch channels. This doesn't occur in any of the other modes Dolby Pro logic II or dts or dolby digital, so it is not my speakers. Has anyone else run across this problem? Thanks