Do you have a link to that design?
https://www.avsforum.com/forum/155-diy-speakers-subs/1530592-baffle-wall-build-using-beyma-tpl-150h.htmllol... I was just about to tag Mike. Was literally just talking to him last week about them. He said they're very close to the ALCONS. More so than ALCONS would like to admit.
Are you guys using just the raw Beyma TPL-150?
Or the one with the 80Hx30V waveguide, the TPL-150H?
If the waveguide version, have you heard a SEOS waveguide and can comment on the differences and similarities?
I'm a big fan of the SEOS waveguide. I love the soundstage it gives. Wonder if a larger version like the SEOS24 would have a throat big enough to fit the Beyman TPL-150.
I will let Mike fill in the rest.
To the OP, are you planning on designing a crossover based on measurements you received from someone else?