What's the smallest pro coaxial you can think of? B&C has a 4". Might require some creativity to fit into a 4.5" tall box. Maybe someone makes one smaller?
Have you given any thought to using a small tweeter array? Similar to what you are doing with the mids, with maybe three smaller 1" Neo domes in a vertical alignment the the upper and lower supplying the "kick" below 2k.
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This would give you the horizontal off axis response you crave, that you cant get with a waveguide, coaxial, full range, or even a large dome.
what about a 1" throat comp on a line array waveguide. https://www.bcspeakers.com/en/products/horn/1-0/0/ME102
If it were me I'd use the SB29RDAC. Note, the SB29RDNC (the tiny neo version) is glued together and the faceplate doesn't come off. I'm thinking about trying to cut it off and put it in a waveguide in a future build, but that is a long way down the road.
Augerpro (https://www.somasonus.net/satori-tw29tx) has a 4" circular waveguide for the SB Satori Textreme 29mm that I would "think" would work, but I can't be 100%. The waveguide is 4.7795 inches in diameter so you would need to just truncate it a little on two sides.
Well with the little Peerless (already posted) I loose some “air” and that’s about it. Meaningless with HT. Even with most stereo I’d still describe the result as ”good”.
Note: a bigger problem is getting the off-axis pressure correct for near-listener’s to that tweeter; in other words left channel can still become to loud for listener’s sitting left of center (and the same for right channel and right listeners). I had to not only use the dipole null to my advantage with ”cross-in-front” of the listener positioning to suppress the output to the near-listener, but also had to use some sound absorption in font of the tweeter. This was with a full center and Atmos. You can see mostly see the results here:
https://www.diyaudio.com/community/threads/ultimate-open-baffle-gallery.123512/page-197
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Yes the ones on the Textreme page will work. USe the ones with no phase shield. The measurements of the SD29SDAC on these waveguides is in my thread, I just haven't made a page at my website for them yet. That said, IIRC distortion measurements at HiFiCompass showed the SB26ADC with better low frequency distortion than the SB29SDAC. Something to consider.
Sica’s 4” coax fits the bill I guess. Rather limited Xmax for a 2 way, but for midrange and HF pretty perfect.
The SB26 looks like the better option with double the P to P excursion of the 29…..thanks. Off axis response is better too.