I used my EV Sb120a sub with mine. It really filled out the sound and permitted me to use a brighter setting on the 30's. I unplugged the sub for the last song of the night (as the party-ers had left and the regular bar crowd was leering at us for invading their space) and it was evident the sub had added a nice effect to the music. BUT, I was pleasantly surprised that the 30's were holding their own and the bass was still in the mix.

I'm am really surprised just how good these CM-30's are.