No worries.

Over on Diyaudio Lyn Olsen did a very long thread on an Altec 416 with an Oblate wave guide. The Altec woofer trades efficiency and a larger enclosures for Xmax low in a smaller box.

In other words you need 4 x the power to run a 2226nd. I’ve never used or build a Yuichi horn But l did correspond with Yuichi. Unfortunately l never got around to making a Yuichi horn. I would probably build a Joseph Crowe horn which is an improvement on the Tad TH4001 horn,

Let me know when your read and l can do a 36 db 650 hertz crossover for just like Tad used.

Ian