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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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17th Oct 2017, 9:26 am | #21 | |
Octode
Join Date: Nov 2011
Location: Manchester, UK.
Posts: 1,874
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Re: Why are speakers elliptical?
Quote:
The radiation impedance of circular pistons has been appearing in acoustics books almost since Rice and Kellog did their thing (20s?), so these are ideas which go a long way back. A book from the 50s, Hunt 'Electroacoustics' Chap 1 gives a nice readable historical review (starting with Benjamin Franklin!) with no maths, if anyone is interested. Sorry - |
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22nd Oct 2017, 7:50 pm | #22 |
Dekatron
Join Date: Sep 2011
Location: Rugeley, Staffordshire, UK.
Posts: 8,830
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Re: Why are speakers elliptical?
I always thought the narrow width provided the higher frequency, 'tweeter' effect, and the wide width provided the bass notes, the 'woofer'. Sort of combining two speakers of different diameters, and to some extent offering the frequency response benefits of both in a single speaker. But I never read that, I just believed it!
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A digital radio is the latest thing, but a vintage wireless is forever.. |
5th Dec 2017, 6:04 am | #23 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Why are speakers elliptical?
Here is a photo of some stretched round speakers that have been pulled from a dead flat screen TV.
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19th Mar 2018, 4:02 pm | #24 |
Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
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Re: Why are speakers elliptical?
Hartley 118 Re "who first thought of using a cone "
My undertsanding was that the first electrodynamic cone loudspeaker was invented in 1925 at General Electric laboratories in Schenectady, New York by Edward W. Kellogg and Chester W. Rice. It may be of course that their patent was to combine a moving coil motor with a conical diaphragm. There may have been earlier cones driven by moving iron motors. |