I've looked at the Sammi line of horn flares then found that they are a little different than the CH-3, 2370, or H-290 flares. The Sammi SH350 is a bolt on exponential horn similar to what is required for the Theater 4 Pi's however, it's dispersion is quite different. It offers a 120°H x 90°V with a cut-off freq. of 600 Hz. I believe the 2370 and similar flares use a 90° X 40° dispersion.
Wayne, what effect would using the SH350 wide dispersion have over the typical 2370 size horn flare for the Theater 4 Pi?