Well I finally bought real tower speakers to replace my front (which were bookshelfs) and I'm having some bass management issues. This is a long post, but I'm trying to be as explicit as I can be. The new speaks (Mission 783) are rated down to 38Hz, so I consider them to be full range enough for music. My receiver is a Marantz SR-19. I have a CD player hooked up using analog RCAs and my DVD player uses a digtial coax. Speakers are neither bi-wired nor bi-amped. I've set my main speakers to Large, but have kept the center and rears set to Small/THX. With 5.1 sources I expect that all LFE, plus signals below 80hz in the rears and center channels will go to my subwoofer (connected by RCA as line-level, not speaker level inputs). So far, so good. When I listen to audio CD's I want to take the subwoofer out of the equation completely, for my own personal taste. I thought that since it's a 2-channel signal and my main speakers are set to large that there would be nothing coming from the subwoofer - but I was wrong! Even in stereo there's some processing that's routing some signal (not sure which) to the subwoofer. My Marantz does have a Signal Direct mode that allows the 2-channel signal to bypass the digital conversion, and in this mode the sub is quiet. Can anybody explain to me how/why I would be getting sound through subwoofer with mains set to large on a 2-channel stereo signal? Something specific to Marantz? Thanks.