@NBPK402 @VDS Do you have perhaps directivity plots of the MEH K-420 vertical? (I can find them on the web)
I am considering building this design, and will likely to make the first cuts this week. But now I hesitate at the last moment to change the design a bit. I could also place the speaker vertically as a solution! (The limited sweet spot is not an issue for me.)
The reason is because I would like to experiment with Bacch crosstalk cancellation software. Then narrow directivity (laser like) is more important than 'wide' constant directivity.
Hence my interest in the vertical directivity behavior.