Jed,
I like the way you try to maintain directivity and a more even power response/off axis response by the use of a dedicated midrange driver, i.e. the Tangband unit in your center channels. Lesser designs (or designers!) don't realize the importance of this. A simple MTM placed horizontally just will not do. I've heard good things about that Peerless/SS HDS unit as well.
Nice work as usual.
Anand.