i have the Denon 3803 which I am setting up. I have a pair of B&W DM620 mains, a 2000IFS centre, some RAM bookshelf rears, REL Strata III and REL Quake II. My room's primary node is 33hz. My mains quoted response is 56hz. Using AVIA, I have done some sweep tests and I know that my mains work down to the rooms main node. I also know that the node is so strong that the sub cannot possibly operate anywhere near it. My mains do nothing below the main node. Thus, I have my mains set to large, LFE to LFE+Mains and the Strata out of phase with respect to the mains set to Coarse 1, Fine 1. Thus its crossover is at 22hz. This prevents too much loading of the room at 33hz whilst the out of phase configuration works since the speakers are not actually driving the same frequencies. But of course, the mains tickle the main node and so does the REL, so being out of phase largely sorts that out (actually in reality it doesnt enough hence the Quake, located at the other end of the room quietly controls that node and damps it to boot!). Further, I set the rears to small, did some frequency tests and discovered that anything below the denon crossover of 100hz was routed to the sub. Naturally I heard nothing because IT is set to 22hz. Hopefully you understand the reason why i have set it to that. Anywho.. This is also true for the centre channel. I can get away with large for the rears, they reach surprisingly deep for bookshelves, but the centre cannot. My question is, have i missed something in the denon that it cannot cope with a sub that is set to 22hz. I thought since I had LFE+Mains set that, as i think it says in the manual, anything below the crossover point is routed to the sub (and the mains if LFE+Mains is set). I had a Yamaha A3090 previously, and it did it just fine, thus it could cope with my slightly unusual subwoofer deployment. Anyone have any ideas about this one? Cheers Chris in addition, i have just discovered that when speakers are set to large, the lowest frequencies are output by the sub as well, even when running a sweep on the rears or centre (LFE+mains mode). is that right? not a problem, i can live with that, in fact in some ways it helps me out.