I urge the tweeter waveguide as that is the only way to have continuous directivity at the crossover. Don‘t you agree?Maybe borrow some aspects, but really not interested in doing an active knockoff.
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If the main benefit is better bass in the room, controlled bass directivity may be worthwhile. There has been no discussion of a dipole bass module ala Linkwitz LX521. From what I have read, some have a major advantage as cabinet resonances are well controlled. See the gainphile speaker results on the Princeton site.
Siegfried’s design is bi-polar. I heard them at his house. They are very nice but they have to be placed away from walls to work well. They are very position sensitive. On most European rooms they will not work well as rooms are usually much smaller than you have in US.
May I suggest that we separate tweeter/mid-low transition and the woofer/enclosure separately to avoid confusion?