[JN] WE bi-flex article

Hans Hedal hans.hedal at post.cybercity.dk
Thu Apr 25 03:07:39 CDT 2019

I suspect the L Cao full range speaker and the Diatone PM610 to be 
influenced by the WE "bi-flex" series (WE 755A etc.).

These guys claim that their speaker drivers are influenced by the WE 
"bi-flex" too:

"The/Audio Nirvana '/CLASSIC' series is an updated high efficiency 
full-range speaker design from the 1950's and '60's. It's a modern 
interpretation of the legendary Western Electric 755A and Altec 755A. 
The 'CLASSIC' series is a high efficiency full-range speaker that uses 
no whizzer cone or phase plug and yet still reaches 20,000 hz. A special 
proprietary design makes this possible." 


John Day wrote:
> Yay, finally something similar to Diatone!
> :-)
> https://jimsaudio.com/l-cao-fa6-alnico-matched-full-range-speaker-6-inches-pair/ 
> On Sun, Apr 21, 2019 at 7:38 AM Hans Hedal via Sound 
> <sound at soundlist.org <mailto:sound at soundlist.org>> wrote:
>     Den 11-04-2019 kl. 13:54 skrev John Day via Sound:
>>>         On 4/10/19 6:30 AM, peter sikking via Sound wrote:
>>>         >hey Joes,
>>>         >
>>>         >the retro vintage modern hi-fi blog has a WE publication
>>>         >article up today that is right up our alley:
>>>         >
>>>         ><http://www.itishifi.com/2019/04/western-electric-oscillator-1947-what.html>
>>>         >
>>>         >enjoy,
>>>         >
>>>         >
>>>         >     --ps
>>     I wonder what modern speakers were influenced by that article,
>>     and to what degree, with what trade-offs.
>>     I think this one was influenced, and Joe immediately spotted the
>>     similarity when I used it in a 2-way back-loaded horn, but the
>>     trade-off is that big peak at 1500 Hz. You really can't use it.
>>     Without that it has a good gutsy sound.
>>     https://www.parts-express.com/pedocs/specs/290-404--eminence-beta-8a-spec-sheet.pdf
>>     https://www.parts-express.com/eminence-beta-8a-8-midrange-pa-driver--290-404?utm_source=google&utm_medium=cpc&utm_campaign=pla&gclid=CjwKCAjwy7vlBRACEiwAZvdx9tHiT9xFN6r_sFJ7lwHK9NhyBDEFYOKeAF0YhdQjbQy5HQVRkszi-BoCIK4QAvD_BwE
>>     image.png
>     For those who forgot the WE bi-flex thread some days ago. Ian just
>     gave an additional example to John's question, about which modern
>     speakers were influenced by this series of WE loudspeakers:
>     "On list is a pair of L Cao full range speaker. The motor is
>     composed of expensive and good sounding alnico magnets. The paper
>     cone is hand-made.
>     The paper cone profile is designed with reference to the legendary
>     Diatone PM610. This cone profile was designed under an extensive
>     research by NHK of Japan way back in 1950's as an effort to make a
>      single cone full range speaker without the normal cone breakup
>     problem of conventional wide range drivers. The result is a
>     no-whizzer design with exceptional frequency response, wide
>     dispersion and low-distortion performance, in par with the cone
>     profile of Western Electric's WE755a."
>     I have no ready-made answers to what degree, and what compromises
>     were made.
>     Hans
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