I'm playing with the concept of narrow / minimalistic baffles and using the driver below the dipole peak.
Drivers are B&G Neo3PDRW, Audax PR170M0, AE OB12. XO is a DCX2496, LR4 @ 350Hz and 1800Hz. The dispersion is fairly even up to around 6kHz, after which the tweeter runs into diffraction problems with the sharp edge.
Gated FR, midrange straight vs. reversed:
Ungated FR, 1/3 octave smoothed, LR4 high-pass @ 80Hz, midrange straight and reversed:
Polars from the front (approximately 15 degrees each except for the last one):
And from the back. The XO needed some delay on the tweeter to phase-align with the midrange on the front, and I'll bet that's partly responsible for the 2kHz null in the back:
I just bought LspCAD, so next up is playing with the crossover, and trying to fix the edge problems on the Neo3 without increasing the effective baffle width too much. Here's one idea:
The sound is pretty enjoyable. I've had the midrange and woofer for a while now, and the dipole tweeter is a new addition. Previously I had a couple different CD tweeters on a couple different waveguides, and I could never get the treble soundstage to integrate well with the rest. Those problems seem to be gone now, and the treble region has taken on a depth and texture that I didn't have before.
