" Purrhaps " the future is active damping, using accelerotmeters on all panels measuring vibrations and exciters to cancel them. A very complicated solution to a ( seemingly ) simple problem, but possibly like active crossover quite practical - once someone writes a suitable computer program. Telescope mirrors used to be very heavy to be ridged enough, then someone made a much lighter one, continually measured it with interferometers and nudged it into alignment. I think someone tried something similar with machine tools.
I love the fact that the Danley speakers don't just *look* like pyramids, they were *inspired* by the pyramids:
1997-11-11 - Coast to Coast AM with Art Bell - Boris Said & Tom Danley - Egypt and Archaeology from Reekola Midnite on RadioPublic
Here's one of Danley's appearances on the Art Bell show, talking about the pyramids in Egypt.
1997-11-11 - Coast to Coast AM with Art Bell - Boris Said & Tom Danley - Egypt and Archaeology from Reekola Midnite on RadioPublic
Here's one of Danley's appearances on the Art Bell show, talking about the pyramids in Egypt.
Thank you for that link. I'm a big fan of Tom's, like many of us.
Always enjoy his perspectives and designs.
Fun hearing his Great Pyramid tests/thoughts.
Please tell me where you think, in that link,
there is an indication the pyramids have anything, even remotely, to do with his speakers.
When I met Danley, the first thing I wanted to hear about was how he was on the greatest radio show of all time 🙂
I'm a big fan of Art Bell (RIP)
Here's where Tom mentions how the Pyramids inspired the Unity horn:
Disappointing stadium sound
"About 12 years ago, a friend teased me about a recent trip to measure the acoustics in the Great Pyramid. Faced with the task of coming up with a first product for a new company, the jab was slightly irritating about using a pyramid to make the sound sharper or something. I thought back to an old Synaudcon class I attended, at a time when my world was exclusively below 100Hz. Don explained about conical horns, that they had good pattern control but also had comparatively poor lf loading.
I was thinking about how to use that shape to get constant directivity and wondering about the poor loading when it hit me. The “horn loading” we all think of has an obvious “high pass” corner based on how fast the horn is expanding. In that view, the hf driver connected at the apex of a conical horn will not have good loading because the expansion rate is initially very fast. Further down the horn however, the expansion rate has slowed and I thought what if I coupled suitable mid driver where the expansion was more appropriate for midrange.
The very first versions were called Unity horns and the newer ones in the last 6 years are Synergy horns. Some of them like an SH-50 can reproduce a square wave over a little more than a decade, spanning both crossovers and it’s radiation pattern has only one lobe, no nulls, no side lobes and MUCH less energy going sideways or to the rear that the systems normally used.
It is the combination of radiating as if it were one driver and vastly less energy radiating to the sides or rear that can allow this kind of sound.
Try this video of the sound check (before the real demo) at Penn State, a stadium that has a new line array system. This is supposed to be re-done with Synergy horns next spring."