Experiment! Even though your speakers can handle full range. You might get better bass running them set to small with the sub set to mono sub. I use two subs for below 80Hz. That works for me but experiment with the crossover frequency by changing the crossover frequency while listening to music. Strategic placement with one sub 180 degree out of phase. Much better articulate bass and I don't have room correction with my 568.2. Bass is very tight and fast top to bottom. Velodyne subs are very accurate subs. I had a ULD15 once. Its an older sub but man was that a good sub. I have Aerial SW12's now. Two of them! Enjoy but remember to experiment with different settings. You might be missing out on better bass response in your room. It doesn't hurt to try and you can always change it back. Create different setups as types and store them so you can retype and test different setups quickly.

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.