Originally Posted by b4z
11'8" X 21'11" X 8' height room with system on the short wall.
One key thing here is to not put them too close to the wall. What you should do is measure the distance from your head to the speaker. Then put a mirror on the wall so you can see the speaker, then measure the distance from the speaker to the mirror and from the mirror to you. It should be 5'-6' (or more) longer. There is a way to fix this if it isn't, but it requires hanging things on your wall.
How will the side firing woofer work in my room?
Woofers essentially don't care unless they're really close to something.
Do they fire inward(pics have them that way)?
Either way, which ever works best.
Will bass be similiar to the m3s?
Different probably. A little weightier, but less warm and soft.
Will bass sound disjointed since they are firing to the side?
No, not at all.
According to NHT the Fours will go lower than my M3s. Hard to believe.
Not that hard to believe if you know NHT!
How is the dispersion overall compared to the M3s?
Wider, but it doesn't have the reverberant field from the back wall. Set up properly, the sound will be cleaner in a narrow room.