Great thread.
I have the SP-CMC-8's and they have been okay, but a little thin on the bottom end. Based on this thread, I think I am going to try:
STC-11's
and, since everyone seems to like the AT853's, I will obtain a pair of SP-CMC-4U's, and probably retire the SP-CMC-8's.
Looks like I'd need the 4U's with a low sens mod if I am stealthing loud rock concerts? Correct?