I mostly prefer to listen in as many channels as are on the recording; that means 5.1 for DD and DTS (I don't have a rear speaker) and 2 for CDs. Although for some I find that DPL-II adds to the enjoyment. I don't think anyone would want to downmix a 2 channel CD into mono.

For TV watching, my theory is that a lot of stuff is really four-channel or five-channel stuff downmixed into stereo for broadcast. DPL-II does a pretty good job of retrieving the original, though of course I'd prefer a 5.1 feed if I could get it. Some stuff, like newscasts, probably would sound better with it off, but I'm lazy and generally don't.

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Matthew J. Hill
matt@idsi.net