18Sound XT1464 + 15" crossover

I'm looking at building a 2-way main with the 18 Sound XT1464 mated to a Faital HF146, crossed to a Faital 15PR400. The usage will be moderate volumes, outdoors but in a large reverberant walled yard. I'm trying to optimize the design not for SPL but for pattern control.

18 Sound has published a bare-bones design with XO at 1500Hz, looks like 2nd order slope. Is this an ideal XO from a directivity perspective? Looking at the polars it seems to be pretty good, especially to match the vertical horn pattern, but still it seems a bit high for a 15" woofer. I will be using active filters and usually go with LR4 but maybe at this XO point a 2nd order would be better?

I haven't worked with narrow pattern horns before. Anyone have experience with this combo or any advice in general?
 
I haven't worked with that combo but I'd go straight to 1khz at 24db/oct as a starting point with active processing. A 15" really should be crossed as low as possible so I suspect the 1.5k was a passive design where steeper slopes are less common and more expensive to build.
 
Last edited:
this horn is nominal 40x60 and widens gradually at the low end
horiz:
22_27_09_849_XT1464_Horizz_polar.JPG


vert:
22_27_09_819_XT1464_Vertical_polar.JPG


15PR400:
15PR400_response_8.gif
 
Last edited: