I've had my sub for approx a year now. With films it's been brilliant, but it's never been plain sailing with music. In fact if anything, it's been a real pain. When I first bought it, I lived in my old flat, which has a serious bass "bloom" around 40hz, enough to be annoying with my existing floorstanders. Since moving, I have a room with seemingly NO bass resonance (see the thread on Taming Room Acoustics for more details). Even in that room, I had problems with the sub, just never managing to get it integrated. A few weeks ago I did some major moving around of my kit, and without the sub, managed to get the system to sound good in stereo. Last night, I just couldn't resist playing with the sub again, using a high-level input from my speakers. What I found was a couple of things: - I'd been using my Q100 (a massive thing which positively dwarfs the newer Q150), in "depth" mode, assuming that it was the way to go. Well just for a laugh, I tried it in "slam" mode. Frankly the change was awesome. Sounds like music again, and actually integrates with my stereo speakers. I can only assume that in "depth" mode something in the amp section changes the timing as it sounded lousy with music like that. - I tried both the sub and main speakers on concrete slabs along with mixing them around. With the speakers on slabs, and the sub on the floor, also sounded like it had massive timing problems, the bass from the sub, just not being coherrant with the speakers. The only way that worked well was with the sub on the slab, the speakers sat on the floor. To me that infers that slabs add "speed" to speakers. Whatever, results in a much more listenable end result in the final incantation. So, I now have a system with great room acoustics, no bass bloom, and plenty of lower level bass which is now controlled. Rock on!!