Help finding a Sub w/ quick punch down to 20hz

09-02-12: Irvrobinson
If you want real 20Hz response at low distortion you're going to need a fair-sized sub.

The REL F110 is about 13"x15"x17" and is good to at least 25 Hz. If you have a strong enough magnet, tight enough tolerances, and enough internal power, you can get to near 20 Hz *and* have serious volume in a relatively small package.

HomeTheaterReview's review of the F110 revealed that a single one could flap the reviewer's pantsleg at 10 ft.

The Svs ultras are really nice.

I believe all the Velodyne Digital Drive Plus models are rated well below 20 Hz +/- 3dB.

I replaced a single Digital Drive 18 with my third generation of Velodyne, two Digital Drive 12 Plus in my two channel system. It's a largish room with a vaulted ceiling. The two smaller subs added to the sound stage as well as the rooms bass nodes have lessened.

Check out Seaton Sound. The website, like so many ID manufacturers, leaves a lot to be desired. However, contact him directly and he will get you the information you need for your room and your budget. His subs are highly regarded by many.

Surreal Sound's Constellation sub-woofers will do it. You can custom select the number of drivers based on the volume of your room. "Dipole bass with an attitude" is their tagline, and it's absolutely true. See:
http://surrealspeakers.com/
.