I've encountered a strange and ever more noticeable quirk in my setup recently, I hope someone can help. The answer may be something stupid, I don't know. Current setup: Onkyo TX-SR600 receiver Denon DVD-1600 Ascend Acoustics CMT-340 + 4x CBM-170 Dish DVR-921 Xbox360 Audio Authority 1154A switch When I watch non-DD/DTS programming, i.e. SD broadcasts, volume is clear and full on all channels, and well balanced. It seems when I switch to a 5.1 signal, there is a huge discrepancy between "inside voices" and "dramatic action." Example: Receiver is set at 50 for "normal listening." I put on a DD-enabled DVD. Scene has 2 people talking normally, I have to crank the volume to 62 to hear what they're saying. Next scene is full of yelling and explosions, my eardrums start bleeding and I lower the volume down to 46. Explosions finish, people start talking normally again. Again, volume needs to go back up to 62. This happens with my DVD player, all HD programming, Xbox360 - basically any digital signal. I have no idea where to start checking for problems. Could this be caused by a loose cable somewhere? All sources (Audio and video) lead into the 1154A and then into the receiver. I calibrated all levels with an SPL meter a while back. Any help would be appreciated.