I'm thinking of moving my m60s to my living room so I can get full range sound in there. I'm thinking a pair of m2s can replace them in my HT.

I always wondered why I bought towers and crossed them over at 80hz when I could have saved a bunch of money and just gotten a pair of bookshelves on stands.

My system:
m60
vp100
qs8
SVS PB12-NSD
Sony Receiver
80% movies
20% casual music listening

What will I miss when I go to the smaller speakers? Will I lose the soundstage? Will I have a bass hole because the SVS sub begins to fall off at 80hz? Will I lose mid bass accuracy?