Perhaps, you should have stated some constraints with respect to your question, such as size weight and cost. This is from the perspective that the best subs out there are very large (as a minimum, think 3' by 4' by 5'), generally well braced and massive (300-500# per side) and very expensive ($10-20k per sub). That is not to say that there are not good choices at other price points and with smaller size. Of the subs mentioned, I would recommend either the larger Audio Physics subs or the Martin Logan Descents. I have had very positive experiences with both, albeit in other audiophiles systems. I have also heard good things about the digital Velodyne self equalizing units but have no personal experience.
