Just demoed the Quad L subwoofer against the Rel Strata 5. Although I work with music, I have never worked with subwoofers & have only recently tried some, due to my imminent purchase of a hc system. I did not test on films, only music, since this was the most important function for the sub for me. I tested with some M & K satellites, but mainly with Quad 11L's. First was the Quad. It's pretty big with a beautiful finish. Has Lo & Hi inputs, but only one gain for both. Lo pass filter goes in 10hz steps descending from 85hz. I had high hopes for this, since I will be buying the Quad 11L's + L centre. First I tried Norah Jones & the results were a beautiful & effortless rich bass sound, which I couldn't fault. However, I followed this with some fairly full on guitar music (not heavy rock) & some dance music. I found the Quad didn't seem to handle faster bass notes that well. I got some quite LF boom. I'm only guessing at this frequency, but I think the below 45hz ish area wasn't tight at all. I tried moving sub further away from wall - manual recommends 8" - but no difference. I also found the 10 hz lo pass filter steps quite restricting, since I really like to fine tune. Then I tried the Rel Strata 5 on the same material, & same positioning & found it solved all the Quad's problems. I've tried the Stampede against MJ acoustics ref200, which I posted my thoughts previously. From these two demos it seems to me Rel really are very good with music. The bass is totally tight & reproduces clear bass guitar notes beautifully. I then checked the Stampede against the Strata, & found the Stampede a bit 'farty' (v. technical) & underpowered compared to the Strata 5. I definitely feel the Strata 5 is quite considerably better than the Stampede, which is in contrast to hifi choice's view. As I said, I didn't try movies & I feel the Quad could be very good here. I think maybe the Q of it's bass curve might give more lower sub bass frequencies than the Rel (just a guess) (Although Rel's quotes as going down to 18hz, whereas the Quad, 35 hz). Whatever the reality of the frequency response I think the Quad might give you more of a thundering bass for explosions etc. in movies than the Rel? Also, maybe the Quad would do better in a different room? If anyone else has demoed the Quad I'd be interested to know what you thought. T.