I purchased an M&K MX-350 off Audiogon several years ago. For music purposes, it was a tremendous improvement over my previous Definitive Techology PFTL15. The Def Tech hit hard for movies and produced tremendous bass for movie effects, but the M&K is much smoother and blends in perfectly with my bookshelf speakers.
For HT, the Def Tech probably would have been sufficient and I think there are many other good subs out there such as SVS. M&K also makes less expensive subs that will do well for movies.
For HT, the Def Tech probably would have been sufficient and I think there are many other good subs out there such as SVS. M&K also makes less expensive subs that will do well for movies.