I do understand that the M22s are ported, and assume that this is the primary difference. The M22s are also spec'd to reach 25 Hz lower than the VP150. Can the extra driver and added efficiency not make up for bass-reflex design, even when properly integrated with a quality sub to cover everything below 85 Hz (or higher)?
Possibly if the enclosre of the VP150 was bigger, the way it is right now I think it comes down to some of the harmonics the ported designs have over the sealed VP100/150. The port just allows male vocals to resonate/react with the room more.
The 150 has an edge over the VP100 and the M22 has the edge over the VP150 but next to the M80s even the M22 sounds a little thin with male dialogue. The best option is still another M80 which most of us are not able to use, thus the VP180 narrows the margin.
