I have a Sub that Axiom OEM'd for Audio Authority (I think). It has 2 aluminum 10" drivers - One firing forward, the other down. The amp is out of the EP350.
Currently it is in a 2ch system only. For music, I only want it for the really low stuff, so the crossover is usually set between 30Hz & 50Hz. I let the M80's fill in the rest. For movies, I turn the crossover up to around the 70 or 80Hz mark.
The most impressive part is how "tight" the bass is. Blends beautifully with the "accurate" bass of the M80's.