Looking for name & pics of a british loudspeaker

forr · 5th January 2010, 10:20 AM

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.

Don Hills · 5th January 2010, 11:00 AM

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.

forr · 6th January 2010, 11:17 AM

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.

Don Hills · 7th January 2010, 11:03 AM

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.

Colin · 7th January 2010, 03:10 PM

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.)

Don Hills · 8th January 2010, 08:54 AM

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.

Colin · 8th January 2010, 06:06 PM

Yup, that's the one I was thinking of. Balsa drive unit, not bamboo, I think.

planet10 · 8th January 2010, 07:58 PM

I'd be interested in seeing that article once scanned.

dave

forr · 11th January 2010, 12:15 PM

Hi,
Many thanks for having found the article and its reference.
I send a PM.

Colin · 12th January 2010, 08:04 AM

PM received. I'll try and find it later this week.

5th January 2010, 10:20 AM	#1
forr diyAudio Member Join Date: Dec 2004 Location: Next door	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.

8th January 2010, 07:58 PM	#8
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I'd be interested in seeing that article once scanned. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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5th January 2010, 11:00 AM	#2
Don Hills diyAudio Member Join Date: May 2009 Location: Wellington	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.

6th January 2010, 11:17 AM	#3
forr diyAudio Member Join Date: Dec 2004 Location: Next door	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.

7th January 2010, 11:03 AM	#4
Don Hills diyAudio Member Join Date: May 2009 Location: Wellington	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.

7th January 2010, 03:10 PM	#5
Colin diyAudio Member Join Date: Aug 2003	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.)

8th January 2010, 08:54 AM	#6
Don Hills diyAudio Member Join Date: May 2009 Location: Wellington	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.

8th January 2010, 06:06 PM	#7
Colin diyAudio Member Join Date: Aug 2003	Yup, that's the one I was thinking of. Balsa drive unit, not bamboo, I think.

11th January 2010, 12:15 PM	#9
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Hi, Many thanks for having found the article and its reference. I send a PM.

12th January 2010, 08:04 AM	#10
Colin diyAudio Member Join Date: Aug 2003	PM received. I'll try and find it later this week.

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