I own SHL5's and previously owned the M-40.1's. Both great speakers. The M-40.1's are the best speaker I've owned... but at half the price, the SHL5's are very respectable, especially when paired with a REL sub.
Your room at 14' x18' is a bit on the small side for M-40.1's, but is probably doable if you have a properly treated room.
Your room at 14' x18' is a bit on the small side for M-40.1's, but is probably doable if you have a properly treated room.