I'm helping a friend of mine build a small budget home theater in his living room. His room size is 14 feet wide by 20 feet long with 9 feet ceilings. Will the M22ti be fine for the mains using denon avr1803 receiver. Since he's on a budget and no room for floorstanders and wife factor he has to go with bookshelves. I'm just asking if m22ti with subwoofer will sound good in his room considering the size? How much difference is the M22ti from M3ti for mains?

Little puzzled between this and your other post, but M22s with a sub should have plenty of dynamic capability for a room that size. The M3s are fine speakers, but I use the M22s and prefer the greater midrange clarity.