@Allen Rich: I have CLXs and 1 BF210 corrected with PBK/ARC and they are in a whole different league than the CLSz's and pair of Entec LF-20s (with new cones) they replaced. Of course, other things have been updated to match, but wow, you will be very very happy with CLXs and BF subs.
6. I'm willing to listen to other ideas.
Sell the CLSs and buy a pair of CLXs. There is a pair for $8,000. Used martin clx for Sale | HifiShark.com
This will be a move to state-of-the-art
I was a long term CLS owner. Bought them as I's in 1988 and upgraded them to II's, IIa's and IIz's and...