My room is 18x14x8 and after much thinking I have decided too to give the 340 a try as L/R main speakers. Not pulled the trigger yet as I am still negotiating with my very tolerant wife a rearranging of the bookshelves where the speaker would go :-)

If I am unsuccessfull my fall back plan is the CBM-170.

I have an Emotiva Fusion 8100 AVR and a Rythmik L12 sealed sub. While the 8100 is beefier than most AVR in his category, it is not a power monster. It can only benefit from being paired with high efficiency speakers such as the CMT-340 or CBM-170.