KEF T15
 

While we're all praising/damning old KEF drivers, does anyone remember
the T15?
Any opinions? It's a large dome tweeter crossed over at 1kHz.


--
Eiron.

KEF T15
 

"Eiron" wrote in message
...
While we're all praising/damning old KEF drivers, does anyone
remember the T15?
Any opinions? It's a large dome tweeter crossed over at 1kHz.



My memory of it was in the transmission line speakers designed by Dr
Arthur Bailey of Bradford University and the subject of an article in
Wireless World in 1972.

A colleague of mine built a pair and he sold them to me when he got
married and moved into a smaller house in about 1977. The T15 by then
was obsolete and a T27 was used to which I later added a Coles 4001
super tweeter. By today's standards the imaging was not so good but
you could rattle windows at ten paces with the clear, solid, and
immensely natural deep bass - you have never heard organ pedal reeds
like it!

Sadly I had to disassemble them about 20 years ago as Management was
getting fed up with the size, but I still have the drivers.

The nearest commercial equivalent was the TLS80, and in a different
case a Cambridge speaker, ISTR the R50.



--
Woody

harrogate3 at ntlworld dot com

KEF T15
 

On 17/12/2015 07:35, Woody wrote:
"Eiron" wrote in message
...
While we're all praising/damning old KEF drivers, does anyone
remember the T15?
Any opinions? It's a large dome tweeter crossed over at 1kHz.



My memory of it was in the transmission line speakers designed by Dr
Arthur Bailey of Bradford University and the subject of an article in
Wireless World in 1972.

A colleague of mine built a pair and he sold them to me when he got
married and moved into a smaller house in about 1977. The T15 by then
was obsolete and a T27 was used to which I later added a Coles 4001
super tweeter. By today's standards the imaging was not so good but
you could rattle windows at ten paces with the clear, solid, and
immensely natural deep bass - you have never heard organ pedal reeds
like it!

Sadly I had to disassemble them about 20 years ago as Management was
getting fed up with the size, but I still have the drivers.

The nearest commercial equivalent was the TLS80, and in a different
case a Cambridge speaker, ISTR the R50.

All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

We've all built transmission lines with Cambridge R50 crossovers.
It was a rite of passage....

--
Eiron.

KEF T15
 

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

--
*One tequila, two tequila, three tequila, floor.

Dave Plowman London SW
To e-mail, change noise into sound.

KEF T15
 

On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

d

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KEF T15
 

In article ,
Don Pearce wrote:
IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting
one unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come
to that. ;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

Ah - yes. Remember that well. As you get older tweeters get less
important. ;-)

--
*Why do overlook and oversee mean opposite things?

Dave Plowman London SW
To e-mail, change noise into sound.

KEF T15
 

Are kent Engineering Foundary still in business?
Brian

--
From the Sofa of Brian Gaff Reply address is active
Remember, if you don't like where I post
or what I say, you don't have to
read my posts! :-)
"Eiron" wrote in message
...
While we're all praising/damning old KEF drivers, does anyone remember the
T15?
Any opinions? It's a large dome tweeter crossed over at 1kHz.


--
Eiron.

KEF T15
 

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

--
Eiron.

KEF T15
 

On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.

d

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KEF T15
 

On 17/12/2015 18:30, Don Pearce wrote:
On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.


Indeed :-) I didn't entirely get it, despite being propped up in front
of his latest and greatest from time to time. He did like to play some
quite eclectic music loud, in quite a small room - which didn't suit me
especially well.

Some of the smaller one driver speakers did sound pretty good - he had a
pair tucked behind a computer that had remarkable bass from (IIRC) a
single 4" driver.

And in fairness, he did have conventional speakers in his hifi room.
Always switching between them - almost trying to like something more
conventional. And a big pair of Ruarks for the AV setup.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....


Will do. Remember him fondly.

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.


Aye, I gather it was grim towards the end. But he seemed OK a couple of
months before - we had a huge curry dinner and he was on fine form. And,
it has to be said, he was never one to suffer fools ;-)

--
Cheers, Rob

KEF T15
 

On 18/12/2015 2:12 AM, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.


**There's no such thing as a "full range driver", despite the clowns who
imagine a single driver can actually cover 20Hz ~ 20kHz with anything
approaching fidelity. I guess if the limits are +/-20dB.....

Don't get me started with SETs and single driver adherents.

--
Trevor Wilson
www.rageaudio.com.au

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KEF T15
 

On 18/12/2015 09:37, Trevor Wilson wrote:

Don't get me started with SETs and single driver adherents.

De Mortuis ...

--
Eiron.

KEF T15
 

In article , Don Pearce
scribeth thus
On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


We are talking about the Keith that lived over at St Neots aren't we?.
--
Tony Sayer

KEF T15
 

On Fri, 18 Dec 2015 14:38:27 +0000, tony sayer
wrote:

In article , Don Pearce
scribeth thus
On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


We are talking about the Keith that lived over at St Neots aren't we?.

That's him. Keith Garrett.

d

---
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https://www.avast.com/antivirus

KEF T15
 

On Fri, 18 Dec 2015 14:38:27 +0000, tony sayer
wrote:

In article , Don Pearce
scribeth thus
On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


We are talking about the Keith that lived over at St Neots aren't we?.

That's him, Keith Garrett

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

KEF T15
 

Trevor Wilson wrote:



**There's no such thing as a "full range driver", despite the clowns who
imagine a single driver can actually cover 20Hz ~ 20kHz with anything
approaching fidelity. I guess if the limits are +/-20dB.....


** The nearest thing ever made has to be the middle section of a Quad ESL63 or any of its more recent offspring.

A single plastic diaphragm, driven as a series of concentric rings via a delay line produces near perfect sound to beyond 20kHz - to a listener on axis of course. Even produces accurate looking square waves at mid frequencies.



..... Phil

KEF T15
 

In article , Don Pearce
scribeth thus
On Fri, 18 Dec 2015 14:38:27 +0000, tony sayer
wrote:

In article , Don Pearce
scribeth thus
On Thu, 17 Dec 2015 17:46:14 +0000, Eiron
wrote:

On 17/12/2015 15:12, Don Pearce wrote:
On Thu, 17 Dec 2015 14:59:11 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Eiron wrote:
All very well but what about the T15?
I acquired a pair of KEF Cantata G4s and can't live with them,
even in the garage, so they'll be on ebay after Christmas.
Unless I decide to give them another chance and re-use them with an
active crossover, as they look very nice with the mirrored domes.

IMHO, a crossover frequency right slap bang in the middle of the most
sensitive part of the hearing is asking for trouble. As is expecting one
unit to handle the top 4 or 5 octaves. Or the bottom 4 or 5, come to that.
;-)

You've just reminded me of poor old Keith. He was a great fan of
full-range drivers.

I was reminded of him this week when I saw in a second-hand shop a pair
of large, nicely home-made, cabinets, each containing a 4" full-range
driver with whizzer cone. Remember this Christmas to drink a toast
to absent friends. "Valves and vinyl, because I say so."
And smoke a Voigt pipe in his memory....

Towards the end he was obviously pretty frail, and on enough
medication to stock a chemist's shop, but he still managed to ride his
huge old motorbikes. I think maybe a lot of the time when he was
extra-cantakerous, it was the pain talking.

d

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


We are talking about the Keith that lived over at St Neots aren't we?.

That's him. Keith Garrett.


Yes of course, went to that bungalow of his and the gear stuffed in a
small "ish" room had to be seen to be believed!. Still he knew what
sounds he liked!...


d

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--
Tony Sayer

KEF T15
 

In article , Phil
Allison scribeth thus
Trevor Wilson wrote:



**There's no such thing as a "full range driver", despite the clowns who
imagine a single driver can actually cover 20Hz ~ 20kHz with anything
approaching fidelity. I guess if the limits are +/-20dB.....


** The nearest thing ever made has to be the middle section of a Quad ESL63 or
any of its more recent offspring.

A single plastic diaphragm, driven as a series of concentric rings via a delay
line produces near perfect sound to beyond 20kHz - to a listener on axis of
course. Even produces accurate looking square waves at mid frequencies.



Don't they just! saw just that at the QUAD factory many years ago when
mine were being upgraded, a very square square wave indeed;!

Makes me wonder how any other speakers could do that as well?.

.... Phil

--
Tony Sayer