Yes, thanks - I was just about to bring that up. In sleuthing around the web I found that fact out - meaning that the qs4s tweeter matches the M22s I believe and the M2s. But, the QS2s match is not as close?

The other bit of info I found is that "Axiom probably discontinued them for a reason." Probably so.

M22s, QS4s, M2 center, Hsu stf-1.