Belgand,
I have the same issue with my Motorola DCt-6208. The levels are so far down in the dirt that I can turn the volume up all the way and only be at a moderate level of volume. I notice this mainly on the digital music channelsand a couple of the HDTV channels. I think it was a major cause of my low end issues in the beginning of owning to 1070. I'm not sure there's much I can do about it. There is now an upgrade to the 6412 so wonde if that would make a difference.