The room is 20x12 with 9 foot ceilings and is fully open on one side. Because of WAF I have the option of either 1 SVS PB12-NSD or two smaller sealed 14" cubes with a Shiva-X powered both by a single EP2500. The price of two of the sealed Shiva-X with amp pretty much comes out at the same price as the PB12-NSD. As far as performance goes I am not looking for extreme SPL, I would just like good extension (20Hz or lower) at 80db. I didn't take into account a BFD in the price as it will be used no matter the sub choice. What do you guys think?