Velodyne DD12 or DD15

I agree with BOB, the SVS Ultra-13 is hard to beat!

I use an HGS-15 with a SMS-1 that I think was Velodyne's approach to room correction before the DD series. Believe me, the HGS-15/SMS-1 pair can deliver that more felt than heard experience when a low organ pedal note is invoked and pressurize your chest when an explosion occurs in a film. Our media room is 19 X 14 X 8. The sub integrates seamlessly, and you are only aware of its contribution when it does something you know the mains can't possibly be doing, like a subtle vibration or shaking the room. The introduction of the organ in a good recording of Saint Saen's 3rd symphony is a thrill. I use an 80 Hz crossover.

db

The new DD series will be shown at CEDIA this year.

I think there's lots of good advice here. If you don't have room correction in your system, focus on that first. It's included in the Velo DD series, but -as dbphd noted - also available separately in the Velodyne SMS-1. You can also get similar bass region DRC in the SVS/Audyssey box. The latter costs a bit more and requires a crossover unit ahead of it, while the SMS-1 has a built in high cut(that is pretty primitive and not worth putting in the min signal path IMHO).

Main point - if you don't have DRC, get it! Either included in the DD series or separately to use with the sub(s) of your choice.

Marty

PS I use an NHT x-2 x-over with the SMS-1 and 2 Rythmik subs. Works spectacularly well, but does require 3 components to acheive x-over and DRC (Pre-amp+nht+SMS) for bass region only DRC . An Audyssey equipped Pre-Pro would provide full range DRC in a single box and full flexibility in your choice of subs.