[Danny Richie]

There is a ton written about this from Toole, Geddes, Olive, Parham, Harman and many others.


https://speakerdata2034.blogspot.com/2019/02/spinorama-cea-2034-2015-ansi-data-format.html

http://www.gedlee.com/Papers/directivity.pdf

https://www.erinsaudiocorner.com/loudspeakers/selah_audio_purezza/

Funny thing is the largest (and usually flat untreated) spot in the room is the ceiling. And its contribution is a direct reflection of the vertical off axis response.

And this typically contributes more to the overall in room response or power response than the horizontal off axis response. Yet I don't recall it ever being mentioned or even measured by Gedlee. And his speakers likely measure very poorly in that regard. 

It is however measured and shown in the last link that you provided. So good for him for showing how his speaker measures in that regard. Sadly it measures very poorly in that regard due to a fairly wide acoustic center spacing, a high crossover point, and a tweeter that is really too tall to be used as a single tweeter.

[Danny Richie]

Thanks, that's what I've seen in simulations, it would be nice to see an L-frame measured though, there aren't many about and I think it has the potential to be a useful solution.

We are one of the only companies using L shaped open baffles.

I've been experimenting with reducing baffle diffraction using large round overs and that is effective at reducing the on axis ripple due to edge diffraction.

You are on the right track there.

[HT cOz]

There is a ton written about this from Toole, Geddes, Olive, Parham, Harman and many others.


https://speakerdata2034.blogspot.com/2019/02/spinorama-cea-2034-2015-ansi-data-format.html

http://www.gedlee.com/Papers/directivity.pdf

https://www.erinsaudiocorner.com/loudspeakers/selah_audio_purezza/

I think you have to ground yourself in reality with books like Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms
Book by Floyd Toole and these concepts build a solid foundation of understanding.  On the flip side, I don't think we can yet explain everything and we still have room for our own investigation.  The two approaches are not mutually exclusive but complimentary.