Ok, thanks. Someone on avsforum.com was wanting advice concerning using either M22's or Aperion 5T as surrounds. Says he couldn't use the QS series because of placement in his columns. When I compared the freq chart of the 2 speakers, the Aperion didn't have any drop in the 17k-20k range. Now I'm wondering if this is indeed correct, or Asperion is mis-representing their product, because if it was that easy to do with a single tweeter, it seems that Axiom would have a frequency graph like theirs also.

Aperion clicky

1) Specs & Features tab, then
2) Download graph clicker is near the bottom.