I've read quite a bit about BM and DVD players here. I just bought a DV563a a few weeks ago. The DV563 owners manual doesn't give a specific range for its small, large setting. All speakers set to large sounds fine. There is one track on the Frank Zappa Halloween DVD that tests the bass. On this particular track "easy meat" the bass sounds a bit boomy. If I go into the large/small settings in the DVD player and set the rear to small it sounds horrible, way too thin and tinny. The reciever's small/large doesn't seem to make any difference at all. This gives me reason to believe that maybe my receiver isn't changing the analogue 5.1 input into digital for processing (and back to anaogue again). If my receiver isn't conducting any processing of the 5.1 analogue input, is it possible I have a totally anaogue front end? IE. Is this perhaps a sign that I'm not converting that analogue signal off the dvd player back into digital? I assumed it would not be. I don't know what the consensus if of this DVD player's bass management. But I'd say it's pretty undesireable. But for me and the limited DVD's I've listened to, not using any bass management sounds fine, except of course that one track's boominess. The rest of FZ's Halloween sounds fine. The entire DVD-A of Steely Dan's "Everything Must Go" sounds great too. I don't think there is any bass issue at all with this one. I seem to be getting good full range sound through all speakers and any redundant deep bass goes out my sub. Does anyone know if my receiver really IS reconverting my analogue 5.1 input back to digital? I know it's not desireable but I assumed almost ALL receivers did this. Which makes spending a lot of extra money on a DVD player with awesome dacs sort of pointless.