My current setup is B&W N805/HTM2/SCM1 speakers with a REL Strata III. While I enjoy the Strata for music, it really has no slam for HT. Hoping to retain musicality (word?) but gain slam, I'm thinking of replacing the Strata with a Velodyne. Will the HGS-18 blend well with my bookshelf-size speakers or overwhelm them? Would I be better off with the HGS-15 instead? My room is approx 12.5 ft (W) x 30' ft (L) x 8' (H) or 3.75m x 9.15m x 2.45m. That works out to just shy of 3,000 cubic feet or 85 cubic meters. I figured if anyone would know it would be the folks on this forum.