I don't recall the exact CDT set I last purchased, I do recall they were 600$ for a 3 way set (ES tweeter, 4'' extended mid range, and 6.5 ES-o6+) and were in my vehicle for 2 months (normally I run drivers for at least 8months -1year before trying something new).
I try not to bash but give my honest impressions.
Based on my experience with CDT; I feel that they are SPL drivers. They do well at high volumes.
The draw back is that they lack clarity (nearly across the board) and can sound somewhat dull. The plus side is at higher volumes they aren't harsh, but that is the trade off.
They should be marketed for SPL, and in that respect they should do very well.
I am not alone in that thinking.
I would hate to have someone drop 600$ for CDT components for a SQ setup and be disappointed. No experience with Audible physics but have heard good things.