Anyone got spec's on the '70's Isophon drivers. - diyAudio
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Old 27th April 2009, 06:04 PM   #1
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Default Anyone got spec's on the '70's Isophon drivers.

Hi there,
I have had a pair of nice 10inch round Isophon driver with cloth surrounds from the 1970's. I got them about 4yrs ago with the intention of building a reverse taper Transmission Line. This years the lucky year when I have the time and money to do the build. I'm not entirely certain that they are going to be suitable for the intended roll so I was hoping to get the Thiele Small specs so I could do some models. I don't want to waste my time or money getting it wrong.

Anyone out there got the specs for these drivers ?

Shoog
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Old 27th April 2009, 09:37 PM   #2
mjf is offline mjf  Austria
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hello.
can you give more information about that speakers (foto,designation,diameter,weight,......resistance of the coil....).
greetings...........
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Old 28th April 2009, 06:55 AM   #3
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They have numbers stamped in red on the back, but they don't corrispond to their catalogues of the era, and they don't exactly match any available from 1976-1978, but they are very similar. I will take a photo when I get a chance later.

Shoog
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Old 29th April 2009, 09:16 AM   #4
Piek is offline Piek  Europe
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Hi shoog,

have a look: http://www.lup-berlin.de/archiv/Katalog/index.html and here: http://wegavision.pytalhost.com/isophon70/

You can measure TSP by yourself with: http://www.fesb.hr/~mateljan/arta/ for example (LIMP) or try to ask in this forum: http://audiodiskussion.de/

-Micha
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Old 30th April 2009, 08:01 PM   #5
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Heres a photo.

Shoog
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File Type: jpg isophon3.jpg (52.3 KB, 111 views)
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Old 30th April 2009, 09:57 PM   #6
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Is that an inverted half-roll surround?

dave
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Old 30th April 2009, 10:25 PM   #7
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No just normal.

Shoog
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Old 30th April 2009, 11:03 PM   #8
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Those look the same as the ones i labeled woofer. AFAIK that was before i started measuring them.

dave
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Old 30th April 2009, 11:35 PM   #9
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I think you may be right in calling them woofers. From what I can see most of the P25's are woofers by that vintage, and those drivers which were still called fullrange still had the clear dustcaps and the corrigated surround.
The paper is significantly heavier than the oval fullrangers I have, also the magnet is about twice as big and thbe cone trav el is massive. I remember testing them nude when \i got them and they sounded quite extended. I will have to hook them up again.

Bit of a shame if they are, as I don't want to move away from fullrange but I do want tighter bass than the MLBIB's can offer.

Shoog
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Old 1st May 2009, 12:24 AM   #10
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Quote:
Originally posted by Shoog
I think you may be right in calling them woofers. From what I can see most of the P25's are woofers by that vintage, and those drivers which were still called fullrange still had the clear dustcaps and the corrigated surround.
The ones i got came out of a sealed 4-way.

dave
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