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Old 5th January 2010, 11:20 AM   #1
forr is offline forr  France
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Default Looking for name & pics of a british loudspeaker

I think it was advertised in HiFi News or HiFi World.
The emitting area had the shape of a stadium, the voice coil looking like a track. So every point of the emitting area was quite close to a point of the voice coil, no more than 1 inch. In a projet publised in a magazine, some cork was used for the box.
I can't remember the name of the brand. Does the manufacturer still exist ? Pictures wellcome.
Thanks in advance.
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Old 5th January 2010, 12:00 PM   #2
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I've seen something like that. I think it was either in "Wireless World" or "Hifi News & Record Review". I'll see if I can find it.
As I recall, it was a prototype driver. I think there was also a square driver described with a square voice coil.
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Old 6th January 2010, 12:17 PM   #3
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Hi Don Hills,
Thanks for your help.
Googling for "rectangular voice coil loudspeaker", I found some asian patents but the driver diaphragm is quite different from the one we are thinking of. Currently, the closest to the initial idea I found is :
Cascasde Technology
Still searching.
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Old 7th January 2010, 12:03 PM   #4
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The drivers you pointed to have the voice coil shape I remember, but the drawings I saw showed only one voice coil. I'm looking through my old magazines, I used to index them but stopped for a while, and I suspect it's in the "waiting to be indexed" stack.
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Old 7th January 2010, 04:10 PM   #5
Colin is offline Colin  United Kingdom
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Aha. Remembered it (I think). It was in HFN and was a single driver, fullrange developed by someone at Liverpool University. The cone material was bamboo and a lozenge shape, similar to the old KEF B139. Paul Messenger reviewed it in that issue.

The cabinet was mass-loaded and each panel was kept separate from the others by cork fillers, to isolate each from vibrating the other.

I got quite interested before discovering the Jordan speakers. By the early 90s the manufacture of them had ceased. I suspect it was part of a government grant initiative which dried up.

I may have a copy of the original article. If you'd like a scan, send me a PM - but it will be late next week before I can do anything about. (Trade show to prepare for.)
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Old 8th January 2010, 09:54 AM   #6
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Hi-Fi News & Record Review, May 1983.
"One-Way Drive" by Dr Carl Pinfold.

Prototype speakers using the drivers were reviewed in the November 1983 issue, in Paul Messenger's "Subjective Sounds" column.

I'll scan them when I get my scanner set up, not anytime soon.
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Old 8th January 2010, 07:06 PM   #7
Colin is offline Colin  United Kingdom
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Yup, that's the one I was thinking of. Balsa drive unit, not bamboo, I think.
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Old 8th January 2010, 08:58 PM   #8
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I'd be interested in seeing that article once scanned.

dave
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Old 11th January 2010, 01:15 PM   #9
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Hi,
Many thanks for having found the article and its reference.
I send a PM.
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Old 12th January 2010, 09:04 AM   #10
Colin is offline Colin  United Kingdom
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PM received. I'll try and find it later this week.
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