They didn't "change" it; they added another model. The VP180 "matches" the driver compliment of the M80's and the VP160 has the same drivers as the M60's.

The cabinet for the VP180 is quite a bit larger, and it has an extra midrange and an extra tweeter. These factors should allow it to play somewhat lower and somewhat louder.

I'm betting that Axiom would say that the VP180 is the "flagship" center channel speaker.

bibere usque ad hilaritatem