+1 to what @johanwholst said.
I use a JBL 2453h-SL CD on the 2384 waveguide, biamped JBL 4722 2-way. User notnyt on the AVSForum has many CD measures on this waveguide between pages 121 and 146 starting at:
http://www.avsforum.com/forum/89-spe...akers-121.html including a Be. I really like the sound of the 2453h-SL, but might consider Be...
I use a steep digital XO at 630Hz as recommended by JBL for this system and sounds excellent. I tried at higher frequency, like 750Hz and 800Hz with the steep XO and it shifted the image up more towards the waveguide. At 630 Hz it the two sections blend seamlessly.
Finally, if you use the 2384, you may have to shape the top a bit (10 to 20 kHz) due to increasing directivity because of its screen spreading compensation - i.e. designed for being behind a screen. See Zilch's measurements to get an idea:
http://www.audioheritage.org/vbullet...l=1#post236160
Personally, I have been very happy with the waveguide - very smooth response and directivity. It is a 90 x 50 pattern, whereas the M2 waveguide has a wider pattern both vertical and horizontal.
Kind regards, Mitch