Besides directivity, 2 important facts with waveguide. First the most important is the time alignment with the woofer. In 70-80's, the woofer was advanced, nowadays no care is given but the waveguide does. The second is the lower frequencies loading. The tweeter can operate at lower frequencies down to 1khz instead of 2khz.
I've done some experiments if you mount the tweeter ahead of the wave guide/cone can give you better effects or actually have it wider apart not so close to the tweeter diaphragm can give you better low end give it to go
I got some B&W 706 speakers and are low dispertion and they only sound good when you are right in front of them. If I do stuff around the room (off axis) they sound terrible. Too muffly! 😅 They are my reference speakers for my speaker building hobby. I make high dispertion speakers and I can walk around the room and still hear highs. 😅
That's likely because a number of B&W speakers cross the tweeter very high and you get a large dip off-axis. Not necessarily that they are low dispersion, just that the crossover point is causing a big mismatch in directivity.
I think wave guides and horns are bad because they color the sound. They might be good at sending sound longer distances, making the sound appear bigger and giving a livelier presentation. But that's about it. Not good when you are going for a more natural sound.
Waveguides have been around for years before Buchardt. They've shown up in the DIY world since the around 2000-ish and Bucharest wasn't founded until 2013. I think the recent prevalence has been the push toward Spinorama style measurements being a high priority for a lot of customers.
It actually rang when you struck it! lol Not that that means it will ring in a speaker....it wont! EVERYTHING resonates! Its a Universal Constant. Do you guys- CSS- make custom speaker terminal plates? With custom engraving?
Yes, all metal with make a noise when you strike it. It is the decay time I'm talking about when I say ringing. The sound dissipates quickly and the energy required to get it to do that is far beyond the forces generated inside a speaker.