ZXPC 11x9" or 17X11" horn

Hello,

I'm hoping to avoid having to buy a big SEOS 24" or JBL 2384 horn for my 1.5 inch exit JBL 2452 driver, but ideally wanted to get down to 600hz for the crossover. This task is seaming rather impossible, with the end game likely being a DIY route.

Couple of questions on ZXPC horns:

I'm aware of the 18X10 ZXPC horn,, but has anyone measured the 17 X 11 ZXPC horn?

11" x 17" ABS 2" Bolt-On Long Throw Horn 90deg x 40deg For Many 2" Exit Driver 647356202421 | eBay

The dimensions of the horn are all different from the 18 X 10

Also, what is the usable frequency cut off for either the (well measuring 15 X 9 (klipsch 510 copy) or this one?

Thanks ��
 
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While this may have its uses, it would be good to see some polars to identify what they are. 40 degrees is not easy to hold. You might be lucky if it's assisted by the inevitable diffraction. Perhaps you'd build a continuation of the upper and lower walls in front of the baffle.