Ok, Thanks to everyones help, I think I got my new DLS (with new replacement amp) set up correctly (I think). On 811s, speakers small, Xover 100, and crossover on DLS all the way up (160). The sound is great! Tight bass without boom. Mixes great with music. But I am beginning to think my room may be too big as I sometimes lightly bottom out the sub on HT (running 811s at about -35db on LOTR(DTS6.1ver), SPL reading about 85db avg). Also, it seems strange to me how hard I have to push the sub to calibrate the sub. On my receiver I have the sub level at 0, and I have to turn my DLS up halfway (12 0'clock) to calibrate. I have an SPL meter, and am just using the THX optimizer on Star Wars II (not the best I'm sure). I am calibrating at 85db. To get the DLS to read 85db's I have to turn it up halfway and have 811s at 0 for the sub level. There is no way I can run the thing hot 3 to 4db's like most people suggest. I can bump the reciever setting for the sub to say +3 or +4, and back down the DLS a little, but it still bottoms out at times (mostly LOTR and Star Wars II). I've tried everything: moved the sub all over the room with still roughly the same SPL readings, and I've added Y cable to go into both inputs. Ok, so again I'm thinking its my room, 19x18x9, but also the back wall there is an open stair well that leads up to a bonus room, (28x15) that does not have a door at the top. I close all the doors I can, but I still find myself wanting more bass. The bass is good, but I find myself wanting to be more powerful, like +3 to 5db's hot, but I can't get this. So, is the DLS just too small? Am I still doing something wrong, is the DLS broken (again)? If I do need a "bigger" sub, would the Audiosource 15 do the trick, would I like it's sound as much? Anyway, sorry to ramble, but any insight from others would be appreciated, especially anyone else who has the 811s, (I'd be curious how you have yours set the the DLS).