Rat, haven't tried other channels, but when I had a full service box it passed 5.1. Talk to Comcast, seriously, they have no clue about anything-3 different people just to activate the box and the installer, after wanting to mount it out of sight, told me I can't because this box does;t have the IR extension-no kidding, it has RF capability-he had no clue.
So much for Comcast-they even told me that no such thing as the HD-DTA exists and after I found somebody who confirmed its existence, told me that it would only get about 20 channels, no more.
I am going to cut the cord if I can find a way to get broadcast tv in real time-can't get it by antenna in my area.
anyway thanks again.