I know this maybe herecy to "dis" the much respected XLS200 but I definitely hear a problem in my room which you may be able to help with. For films I love it, definite improvement at the low end over my previous sub (Yamaha YST90), and I don't need a sub that plumbs any deeper, shakes windows etc. We have the setup in the living room which also has an open plan staircase, (don't you just love modern houses) and the kids are normally in bed when we watch films. So normally have the volume at -25 to 30 dB. For music, however, I'm not so happy. In my room the sub definitely appears slow. My favourite test DVDs to prove this are Hell Freezes Over (Hotel California when the Drums (Conga) start) and Fleetwood Mac's The Dance, (Kick drum at the start of The Chain). Having played Drums for 30 years and a bit of Bass (badly) I suppose I notice these things more than some, but there is a definite difference between my system and my mate's M&K K-series. From what I can hear, I don't think the problem is a delay to the start (attack) of bass notes from the sub, in relation to other speakers, but it's an extended decay (or overhang) that causes the perception of "slowness". Instead of a kick drum producing a Doof, I get a Dooffffff. For info I have tried various crossover and sub volume settings, Low and High-level connections, mounted the sub on Granite slab, none of which improve the decay. I think there are two possibile causes of this problem and would appreciate any advice on which one you think is more likely. 1. XLS200 not up to the job because - a. Inherently slow (Have only seen 1 other owner out of many complain so far) b. Not run in yet (Had about 20 hours use so far). c. Needs a better power lead (was mentioned in another thread but I have only tried a couple of different kettle leads with no improvement, although I am planning to build a better DIY cable). d. Needs a better interconnect (Just got a Mark Grant sub cable - increased the volume slightly but no difference to decay). or 2. Room problem - I have a 10-15 dB peak at about 35Hz. Have tried re-positioning sub but it doesn't improve this much. I suppose my question is could a room node cause the problem, in which case I should start looking at BFD etc to flatten it, or should I look for a more musical sub a la MS909, B&W675, Rocket (nice finish apart from the black top/bottom), or the omnipresent SVS (probably too big methinks and I don't really need my trousers flapped). Simple question really, shame it took me 1000 words to get there.