Before I dive into the Monolith article, I should mention that the W-horn in mind is intended for midbass applications only, from 100Hz up to 800Hz/1kHz. The mid/high section will be mounted on the front center panel dividing the 2 horn mouth sections. In essence, I'm trying to redesign the ancient MacPherson M1S/M1X stacking full-range cab. I have an old product sheet, however it doesn't reveal any inner details about the driver mount or the horn folding. The M1X isn't even in their archives anymore.