I use Aerial SW12's. One in the front and one in the back of the room. Excellent subs! I have a party every year for the Daytona NASCAR race and there are so many people in the room that I end up sitting on one of my SW12's in the back of the room. I can't even tell that its on when the subs come alive. My crossover is set to 80Hz and I can not localize these subs even standing right next to them.

I used to have a Velodyne sub. ULD15! You can't go wrong with Velodyne subs. They will play lower than the Aerial SW12. The Aerial is ported and rolls off below the port frequency. Don't get me wrong the Aerial still extends pretty low but I remember having good output with my ULD15 even at 8-10Hz. The Aerials will not extend down that low. Bach organ music was awesome with my ULD15. I have Aerial 10T's and a CC3 with Bryston monos up front.

I think you will be happy with either of these subs. If I were to start over now I think I would go for the Velodyne and save a little cash. Plus the new DD subs have auto room frequency correction. The servo feedback to reduce distortion offers nice tight clean bass too.

Ron

HT: 568.2mm (Revelation One filter), 518x2, SB3, Bryston 7BSTx3, 8BST, Aerial 10T, CC3, SW12(Qty2) w/SVS AS-EQ1, MK Tripole x4. JVC RS1u, DVDO Duo, Oppo 103 w/Vanity103HD, Sony PS3, VIP 3D Theatre, Acer H5360. Logitech Ultimate Remote and Hub.