Having used a REL Studio 11 briefly in my old large living room (34' x 18' x 9'), I can let you know that if you have a larger room or like it really loud you should look elsewhere for bass. The Studio used to bottom out in my room when playing some films at refrence levels. I switched to an M&K MX350THX (as used by most of the big film makers) using 2x12" rather than the 2x10" in the REL and for less than half the money I got a real jump in output level and performance and none of the chuffing that I heard from the REL at higher output levels. I think sticking with small drive units which are then ported is the problem with big RELs. All really high end speakers I've been impressed with are sealed enclosures rather than ported for a faster response. Perhaps this is why no REL has achieved THX apporval. If you want the ultimate bass though, I challenge you to try the new M&K MX5100. At £3,200 it ain't cheap but it's in a completely different league to anything REL have ever made.