Further to my earlier general post and following suggestions I think the three subs on my list are: Power Buy Velodyne CHT8 Rel Quake BK XLS200 Ignoring price, what are the pros and cons of each of these? On paper the CHT8 seems the weakest in terms of really low bass, but how does it perform in reality? Quake seems to generally get good write ups and on paper goes pretty low. Not sure about the XLS200 other than it has been recommended. Thanks again! Andrew P.S. Is £500 for a nearly new Storm III good?