Subwoofer recommendations for this system?

Easy one. ACI Force. One of the most musical subs you can buy with surprisingly high clean output capability. Having compared directly to REL Strata III and Storm III, the Force was the winner as far as my friends and I determined. Looks very cool as well!

Check this out. I know it's never recommended because it's not really advertised by Sunfire that much. Give a listen to their Architectural Series. It is designed for two channel systems. One front firing 10" or 12" woofer, depending on model. I did tons of research and listening when possible. Spoke to Bob Carver and others. You can find this baby, brand spanking new, nicely discounted. It's fast,very low extension and seamless with my system. I have the Revel M20s and set the sub's x over to handle the lowest end. Does everything a quality sub shoud do. I listen to mostly jazz, but his baby, if you want to show it off, will rattle windows and pictures. I love mine.

Yeah, I forgot about the ACI line of subwoofers like the Force, Titan and Titan II. Many people have compared them favorably to RELs and some of them actually will fit within your budget brand new.

Given the equipment you own, I'd surmise that reproducing the essence of the recorded music is a high priority for you. Hence, think about subwoofers that are noted for their musicality as well as their ability to cleanly reproduce the lower frequencies, and for their ability to integrate seamlessly with the rest of your system.

With those two criteria in mind, the Vandersteen 2Wq subwoofer should definitely be on your short list. Used units often sell here on Audiogon for $800-950.

You might want to do a search of Audiogon's archives to look at the many articles that have been posted about subowoofers, including the summaries of articles about subs taken from a number of audio mags. If you do so, you will note that 4-5 subwoofers consistently rank near the top, with the Vandy 2Wq being one of them.

We have similar rooms and satellite speak efficiencies (Ref 3A de CAPOS- 92 dB). I recently added a SV Sub PC-Plus. I am very happy $750.00. If you go that route, tell them Robert Hart of Audio Tweakers sent you. No commission, just brownie points