Sonnie,I would stick with the Velodyne. They have never mis-represented
their low frequency extension capability,peak SPL output vs frequency or their distortion specs. This is very rare thing among subwoofer mfg.
If you consider another brand of subwoofer it should out perform the
Velodyne in all areas and have the MEASUREMENT GRAPHS to back up the claims made for it. Accept nothing less when it comes to this sort of product.
Scotty