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In Reply to: RE: Dick Heyser posted by tomservo on January 26, 2023 at 14:29:09
~!
The Mind has No Firewall~ U.S. Army War College.
Follow Ups:
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.
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.
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/
John Atkinson has striven to do that as well.
Maybe some day that dream will coalesce.
~!
The Mind has No Firewall~ U.S. Army War College.
more than one individual *have* gone down that theoretical path.
-!
The Mind has No Firewall~ U.S. Army War College.
Examples: Transparency, rhythm, truthfulness to the recording venue, immediacy, naturalness, realism, airiness, wetness, dryness, lushness, being congealed, completeness, soundstage dimensionality.You assume way too much. Even Heyser admitted he was puzzled by lack of correlation between what he heard and what he measured. Obviously some things are measurable. Like frequency response and SNR. Duh! Alas, he died too soon, I could have straightened him out. If only he could have hung on for another 15 years or so.
Edits: 02/08/23
~!
The Mind has No Firewall~ U.S. Army War College.
What things do you hear that can't be measured?
Edits: 02/13/23
I can describe a couple examples with loudspeakers, things like Heyser was after and what I have been working on for large scale sound..
You have two different speakers, they each have a very similar spectrum / frequency response and when you walk into the room with them playing one at a time, they sound similar. With your eyes closed playing one at a time standing in front of them, it is easy to point at each BUT with one type it was easy to guess/localize how far away it was, while the other was easy to point at but how far away it sounded depended on the recording.
In stereo, one pair virtually disappears within the phantom image, you may not even be aware of the speakers while the other pair presents a stereo image AND the right and left speakers stand out as part of the image.
Same situation, two pairs of speakers with very similar response but in stereo one pair present the mono phantom voice as a person standing in front of you, the other presents a wall of that persons image and everything else.
If you know what does these things, one can minimize them , to find the causes takes modifications, measurements and listening in a repeat as needed loop..
I come from future. I have some good news and bad news, mostly bad news for you. We found out quite some time ago having unused audio equipment in the sane room screws up the sound. That goes for speakers, cables, electronics, everything. Take it all out of the room immediately!
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