Hi SJM
I expect you're going to love the M60/VP160 speakers. I have the VP160 and think it compares very favorably to the VP180 which I also have. The VP160 and 180 are by far the best center channel speakers I've had, and I've had a bunch.
I have a pair of M100s. Currently, I'm using an Epik Legend twin opposing 12" sealed subwoofer. I like it.
Powered subwoofers will relieve the amp and speakers from working hard below the cross-over frequency, which I figure for the M60 should be about 60 Hz. Experimenting with your favorite will be fun.
For music, I prefer a sealed subwoofer, but you should check the specs to make sure the sub can be crossed over at a sufficiently low frequency to guard against bass bloat.
I'm looking at the Axiom EP500 but the EP400 would work beautifully with either the M60s or M100s.
Enjoy your new Axioms. They are superb speakers. Enjoy the music. Welcome!
