I am looking to get a subwoofer to compliment my M80s.

They will be part of an (eventual) all Axiom 7.1 system in a 3300 cubic foot home theater.

What I am looking for is a sub that will provide plenty of LFE for movies - "musicality" is of secondary importance.

So my question is what does the 500 provide that would be missing with the 350?

At first blush the specs seem similar - will the extra $500.00 be that noticeable in movie watching?

Any comments are welcome - thanks.