I think for HT purposes they are still excellent subs. I used to use an MX105 mkII in a combined music/HT room. At the time I used the room for more HT than music and the sub could shake the walls. M&K subs are excellent for HT. I've since made a changeover to more music and traded the M&K for a REL Strata III. For music, the REL is much better. It blends better and yields a more defined bass. Hope this helps.
Mike.
Mike.