I use the 2384 waveguide in the JBL 4722 package. I swapped out the stock 2432H for the 2453H-SL and could not be happier. I use a digital XO and cross at the factory recommended 630 Hz. I have tried 800, 750 and 700 Hz and to my ears the 630 Hz XO point integrates best with the 4722.
There is a long thread on AVSForum about the 4722, and user notnyt has tried/measured various CD's on the 2384's from threads 121 to 145 or so.
http://www.avsforum.com/forum/89-spe...akers-121.html
Also, he built a center channel with, I believe the STX here:
http://www.avsforum.com/forum/155-di...l#post49566433 Maybe reach out to him as he has heard/measured both...