They are ok subs. But they don't get low at all!!! used mine in 1.3sealed and try one in my ht enclosure (2.4 tuned at 28hz) and it wasn't sounding great at all. I did a direct swap with my ht box with a type r and the R is definitively hitter lower and CLEANER... the 307 was missing a lot of note.
They'll take 450watt anydays, you blow yours with clipping