I am looking to buy a sub under £500 purely to add a little bottom end to my Proac tablettes 8 signatures (I use a Musical Fidelity X v3 pre/power and DAC). My main concern is get this extra without messing up the sound I already get from the Proacs which are very fast and transparent. I only want to hear music and don't really care how convincingly a sub can reproduce the sound of depth charges. I have seen a lot of postings in favour of BK XLS 200s and the bigger one (thingammey?), as well as favourable comments about the Velodyne and SVS models. The problem is I have not seen a professional review of the BKs or a particularly music-focussed review of the others. I am also tempted by an Axiom 175 or even 350 from Canada, but am reluctant to buy something not professionally reviewed or auditionable (if that is a real word.) What would be my best bet? I can see the argument that you can't really go wrong with BK at £279, but is this really going to add anything to a decent hifi? Would I be better letting the children starve for a bit and buying a REL Stampede? Or worse.