Hi all,
My aging DLP rear-projection set has quite large internal speakers and decent sound quality---certainly good enough to watch TV news. And they aren't shooting war coverage in DD 5.1 surround so far, though I'm sure that will come.
So I have the system set up so I can casually turn on the DLP with its own speakers or use the whole AV receiver/amp/5.1 system for appropriate material.
Contrary to some others here, I do not want 5.1 on to watch college basketball or baseball, tennis, etc. I find all the crowd noise distracting and the inane "commentary" by sports "analysts", who don't seem to realize we're watching television (duh. . .) and not every on-screen action needs elaborate description in near hysterical tones. As it is, I turn the TV volume down really low so it's barely audible on sports events. (End of rant.)
On the other hand, I watched an HD documentary that did have stereo sound, on a unit's advance in Afghanistan, and I put that through DPLII and it was impressive.
Regards,
Alan