I am referring to the ones that work off of stereo signals for playback on 2 channel systems. I'm not referring to DPL. When I first started reading about them a few years ago, I thought it was a hokey idea. But now that I'm building a 2 channel system in the living room, I want to give it a try for my DVD playback. Two companies that come to mind: HK and Panasonic. Anyone ever try these modes? Do they do anything at all? Thanks. Rich B.