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RE: Dick Heyser: The only man am aware whom tried to cor-relate measurements with what we hear~nT

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tomservo

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In Reply to: RE: Dick Heyser: The only man am aware whom tried to cor-relate measurements with what we hear~nT posted by Cleantimestream on February 02, 2023 at 19:22:56

He was the first so far as i know, before his TDS invention, there was no way to measure the acoustic phase of a loudspeaker, his visual description was imaging a loudspeaker driver who's physical position changed moving forward and back depending on the phase and wavelength in question.

That paralleled the Beta tape vs VHS tape issue, Beta was better BUT was narrowly licensed while VHS was widely licensed.
Even now his TDS approach has much better noise immunity than the modern impulse based systems.

Follow Ups:

RE: Dick Heyser: The only man am aware whom tried to cor-relate measurements with what we hear~nT - Cleantimestream 09:02:03 02/04/23 (1)
In the time domain, the wave launch and character of what we hear is Vast and changing, markedly influenced by our chosen listening environs . Your designs have consistently Been a logical progression in meeting the demands for, dare I say it? More realistic delivery of music. I never forgot the wave launch you created in that parking lot with the mono speaker. The recording soundly trumped anything I had heard in the past.... the astonishment augmented by the realization that I could perceive this whilst Not being THERE!
I have said what I wanted , was the midrange of a Quad ESl 63 , the highs of an ion tweeter and the horn bass of a Klipsch.... the wave launch of all these designs is different and no passive crossover is up to the task. I seriously doubt my active crossover with DSP can achieve what your approach has done.
The Mind has No Firewall~ U.S. Army War College.
- RE: Dick Heyser: The only man am aware whom tried to cor-relate measurements with what we hear~nT - tomservo 07:47:53 02/05/23 (0)
  The ESL-63's i am familiar with, in fact they had an impact on me at a time when i was making flat and curved electrostatic drivers. My Boss at Intersonics has 63's and asked me to "fix" them which meant by passing the protective spark gaps.
  I said ok but cautioned that ALL of the ESS drivers i made eventually died sparking death in the quest of higher output (also his complaint and some months later so did his).
  
  Having them home i listened to them in front of my home made ESS speakers and was struck by one unexpected aspect of their "sound".
  
  At times it sounded like the origin of the sound was behind the panel and my conclusion was it was the effect of radiating much of the sound from a single point who's radius put the origin behind the rings of radiators caused by the delay network.
  
  That radiation from a single point in time and space, creating the the radiation or as you say Launch of a single simple acoustic source and confined to a specific angle was the upshot of the original Unity horn and then the current Synergy horns.
  I don't know how good an explanation it is but i was asked to explain that horn and some other stuff on the fly a while back. The "Expansion rate" video here goes into that.
  Anyway, thanks for your kind words.
  Tom
  
  https://www.facebook.com/watch/126113687424773/423500813293005/
  - Expansion rate (Open in New Window)

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