With a -3db point for the M3, you are missing quite a bit even in music, so absolutely, you would benefit from the right sub.

I don't think that the EP175 is nearly powerful enough to work well in that space though. The ep350 might do the trick. It does very well in my 3,200 cf space with power to spare.

Is this for music, movies...?

Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!