Last Saturday I opted for the REL Strata III to set it up with the main system speakers Paradigm Studio 40 v2. I always thought that I might never need a subwoofer since I had very bad experience with subwoofers in systems other than mine. It may just be that the user had not spent enough time to tweak it to perform well. Nonetheless, since I already bought one I decided to spend as much time needed to get it to blend well in the system. The Strata III is certainly a very flexible system and there is no way one cannot really tune it well to mate with the main speakers. The tweaking thus far has resulted in following settings in combination with the Paradigms Crossover frequency: 28 Hz (thinking of a lower crossover point but need to check that out) Gain: Between 10-11 oclock (may change depending on the crossover setting) Phase: 0 Deg Position: 3 inches out diagonally from the corner behind the left speaker (the bass is locked here with max loudness so will leave it as it is) Some of the music I chose to lock the bass while setting up the system was Rain from Madonnas album Immaculate Collection, Dave Grusin Migration and Nusrat Fateh Ali Khan and Michael Brooks album Night Song. After spending almost 20-30 hours spread over 5 days the system is very much listenable with amazing low frequency extension. The sub has actually disappeared so to say. The difference is only noticeable when it is switched off, but who would want to switch after knowing what is going to be missing! I also own the Chartwell LS/3/5as (15 Ohms version) and was really curious about pairing them with the REL. I had to spend less time with the set up since I had done most of the work while setting up the Paradigms. The difference was that I had to change the crossover frequency and set it at 53 initially, but, later bringing it down to 43, I am now extremely pleased with the results although some more fine tuning may be required as and when I get time to listen to a variety of music. I am amazed at the soundstage and the depth that the two are providing me. I use the Quad 606II to drive them. The female vocals were always good but now the added low end has made the whole system sound even more terrific. I exclusively listen to Ella, Stan Getz, Antonio Carlos Jobim, Joni Mitchell, Diana Krall and flamenco guitar CD's on Chartwell. Paradigms just do not do justice to these artists. I also had a pair of Rogers 11 Ohm version's (belonging to a friend) handy and wanted to see what difference it makes when replaced with the Chartwell. Rogers were more upbeat and could handle rock music better than the Chartwell, but, the high frequency of the Chartwell was slightly superior, airy so to say compared to the Rogers. Dire Straits sounded better on Rogers and Diana Krall on Chartwell. I guess there is plenty of room to further fine tune and tweak the system to get even better sound in the days to come. Maybe it might just start to sound better on its own as time passes (break-in??? Not sure if it can be detected by ears over a period of time - say 50 -60 hours) I wish I had acquired the REL much earlier as it sounds so good with the babies.