I am thinking of buying a sub, but need a little advice first. I currently have as main speakers Kef Q55's, which do have great bass response. So that said, I need a sub that can underpin these speakers. My room size is also a consideration being 22'x12', quite a large room, so a sub to match this also. I do not want to make a mistake here and buy something that has little effect, so good advice is what I am after. As a starter I have been thinking of the B&W 675 or MJ ref1. Music is as important as movies so a good all rounder would be nice!