[JN] WE bi-flex article

Christian Rintelen christian at rintelen.ch
Thu Apr 25 04:36:48 CDT 2019

a company that named  itself «Commonsense Audio» and sells a product called «Audio Nirvana»?? bruahaha 🤣

(that’s where audio got its bad reputation from. really!)

_ _ _
aka christian rintelen

> Am 25.04.2019 um 10:07 schrieb Hans Hedal via Sound <sound at soundlist.org>:
> 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."  https://www.commonsenseaudio.com/nirvana.html <https://www.commonsenseaudio.com/nirvana.html>
> Hans
> John Day wrote:
>> Yay, finally something similar to Diatone!
>> :-)
>> https://jimsaudio.com/l-cao-fa6-alnico-matched-full-range-speaker-6-inches-pair/ <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 <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/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 <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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