David Karmeli’s Bionor/Lamm/AS-2000 Audio System

[Audiohertz2]

Electrical phase and physical alignment. If the electrical phase is correct then you adjust the driver distances such that the impulse of each driver reaches the ear at the same time. A step response tells the whole story of what is and what is not time coherent.

Its can only be time coherent physically in the Nearfield at a specific predetermine distance , itscwhy so many are not affected by poor step responses , electrical its different and may not be noticeable too, eg when a tweeter has reverse phase, very few can hear this , also if drivers are ran in reverse phase to compensate acoustically then you have to examine its acoustic properties / phase rotation.

Transfer function is a big part but like everything its the complete package making the difference and not all are sensitive to it , hence why so many ridiculous designs


Regards

 

[bonzo75]

Thats all what you need to build your own bionor sold in Ebay Kleinanzeigen 4 weeks ago.View attachment 127568
Frequency responce looks good 50-16khz +- 3db right side above diagram

View attachment 127569
The xover 12dbView attachment 127570

hi what exactly is this? Drivers and the metal brace? How much was the ad quoting it for

 

[morricab]

Its can only be time coherent physically in the Nearfield at a specific predetermine distance , itscwhy so many are not affected by poor step responses , electrical its different and may not be noticeable too, eg when a tweeter has reverse phase, very few can hear this , also if drivers are ran in reverse phase to compensate acoustically then you have to examine its acoustic properties / phase rotation.

Transfer function is a big part but like everything its the complete package making the difference and not all are sensitive to it , hence why so many ridiculous designs


Regards

You can’t have a correct step response unless your electrically in phase (and minimal group delay) and correct physical distance of the drivers to the listener. Invert the tweeter or the mid (in a three-way 2nd order filter on the mid) and this will distort the step response. Group delay you will see the drivers contributions separately rather than a sharp right triangle. As to audibility, one of the things that bothers me about Wilson’s is that I can hear they have inverted the mid…it affects timbre.
Have you heard the effects of time correction on a non-coherent speaker? It is pretty audible. I am not talking about altering the frequency response, just fixing the impulse response.

I only brought it up because MarcelNl was saying he liked time coherent speakers but then was talking about Bionors, which are almost certainly not time coherent.

You are right that many can’t hear these issues…

 

[DasguteOhr]

hi what exactly is this? Drivers and the metal brace? How much was the ad quoting it for

All drivers , xover and the holder for horn. All what you need to do is to made baffle for the bionor.
You can find construction plans for it on the internet. A fixed price was not mentioned, I guess the highest bidder got it.

https://www.pinterest.de/pin/704180091708150871/