size and brand subs?

Velodyne specializes in manufacturing powered sub-woofers. Excellent name in the business. However my hi-fi specialty store has been having some bad luck with a few of their models. They like the B&W line of powered subs. For that size room, you may want to consider the ASW650 or ASW675. The ASW675 offers 500 watts of power in a paper/kevlar/aluminum cone. The ASW 650 uses mostly a paper cone. I have the ASW600 at 150 watts which is plenty powerful for me in a room 13' x 23' x 8' high with two openings out to the rest of the house. Not sure about their list prices but I believe the 650 is at or just under $1K. There are many brands of subs on the market. Just giving you my experience.

I bought a used ASW CDM a while back and it is way too powerful for my current needs. So I dial it at about a quarter of a turn. Even then, it can sometimes be overwhelming. Maybe I'll get to move into a bigger house and really get to use it to its potential. I just couldn't pass up the deal. I think it listed at about $1600 and I got it at half price slightly used. The walls literally shook and pulsed at half-way up. The wife was not too amused. Its pretty good at music too. I turn it down a little for music.