Our kids bought us a 70” screen for Christmas. Yeah! So we got a unit with shelving and filled it with my meager stereo gear which includes a Rotel RA-1062 and B&W 685’s and am using it for both A&V. Now I want some beef and want to add a solid sub. Looking at the SVS SB2000 Pro. Room is 15x22. Good fit? Overkill? Thanks in advance.