Latest measurements of my system. Purchased a Dayton DSP 408 to fool around with, which is a relatively cheap unit but with potential nonetheless.
JBL 2213nd (24dB octave low-pass @ 1000hz)
JBL 2420 on 2307/2308 horn/lens combination (18dB high-pass electrically @ 1000hz - modified voltage drive between 1khz and 2khz - no low-pass)
JBL 2405 (24dB high-pass @ 16khz)
SVS subwoofer (yet to finetune) takes over below 60hz.
All units time electronically time aligned to the vertical axis of the 2420 (So not aligned at the listening position, but rather as you would simply align the units physically).
Please note filters are electric and the acoustic slopes differ slightly.
Listening window (0° - 10° - 20° - 30° average) @ 1m at acoustic axis between 2213nd and 2308.
L/R speaker average around listening position + L/R average with target curve.