In article , Nick Gorham
wrote:
Tat Chan wrote:


'crowbar'? do you mean arcing?

No, the first quad els was prone to arcing if overdriven, so the 63 had
a crowbar protection circuit that protected the speaker, but upset
amplifiers that didn't like driving a short circuit.

'Fortunately' sic they used to fit triacs that were 5-amp rated
(continuous). Hence if your amp is enthusiastic it can vaporise the triac,
then have a go at the speaker. 8-]

Never a problem with amps like the 405 as they used current limiters to
protect the triac as well as the speaker and the amplifier. :-)

However provided your apm never applies excessive volts, there should be no
problem. FWIW I cheerfully used the 63s with a 200W amp for 20 years with
no problems.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

A good point perfectly made, IMO..... (Keith)

Bloody hell, Keith - you have reformed. Have you been having speech lessons
from Professor Higgins?
"How niiice of you tooo let me post"

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

On Mon, 01 Nov 2004 13:30:49 +0000 (GMT), Jim Lesurf
wrote:

Meridian is the leading advocate of this approach in the field of Hi-fi.

Yes. My regret is that they don't make Electrostatics. ;-)

Have you seen Siegfried Linkwitz's web site?
http://www.linkwitzlab.com/

His open baffle designs look as if they could equal ESLs in most ways
and exceed them in dynamic range capability. The open baffle design
immediately puts them at the same level of ESLs in terms of two of the
ESLs main advantages: no boxy colourations and a figure eight polar
response to reduce room mode excitations.

Bill

In article ,
wrote:
On Mon, 01 Nov 2004 13:30:49 +0000 (GMT), Jim Lesurf
wrote:

Meridian is the leading advocate of this approach in the field of
Hi-fi.

Yes. My regret is that they don't make Electrostatics. ;-)

Have you seen Siegfried Linkwitz's web site? http://www.linkwitzlab.com/

His open baffle designs look as if they could equal ESLs in most ways
and exceed them in dynamic range capability. The open baffle design
immediately puts them at the same level of ESLs in terms of two of the
ESLs main advantages: no boxy colourations and a figure eight polar
response to reduce room mode excitations.

I'd agree in part with the above. Indeed, a few years ago we had some
students work on developing some novel 'baffle' design speakers. However
they still have the problems that can arise from cone resonances,
nonlinearity, etc. Also baffle resonances for the conventional designs.
(The old Warfedale SFB design is a neat idea, though. Shame the design has
vanished.)

The results did sound quite good in the test units we made, though.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html

On Tue, 02 Nov 2004 10:02:03 GMT, wrote:

On Mon, 01 Nov 2004 13:30:49 +0000 (GMT), Jim Lesurf
wrote:

Meridian is the leading advocate of this approach in the field of Hi-fi.

Yes. My regret is that they don't make Electrostatics. ;-)

Have you seen Siegfried Linkwitz's web site?
http://www.linkwitzlab.com/

His open baffle designs look as if they could equal ESLs in most ways
and exceed them in dynamic range capability. The open baffle design
immediately puts them at the same level of ESLs in terms of two of the
ESLs main advantages: no boxy colourations and a figure eight polar
response to reduce room mode excitations.

How does he get over the high levels of distortion generated by
speaker cones, especially at low frequencies?

I suspect that one of the reasons for the 'openness' of electrostatic
designs is their linearity, and hence low levels of intermodulation
distortion.


--
Chris Isbell
Southampton, UK

"Andy Evans" wrote in message
...
A good point perfectly made, IMO..... (Keith)

Bloody hell, Keith - you have reformed. Have you been having speech
lessons
from Professor Higgins?
"How niiice of you tooo let me post"

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

He's got it, by George he's got it!

"Andy Evans" wrote in message
...
A good point perfectly made, IMO..... (Keith)

Bloody hell, Keith - you have reformed. Have you been having speech
lessons
from Professor Higgins?
"How niiice of you tooo let me post"


Pip pip, old bean! ;-)

"Mike Gilmour" wrote in message
news

"Andy Evans" wrote in message
...
A good point perfectly made, IMO..... (Keith)

Bloody hell, Keith - you have reformed. Have you been having speech
lessons
from Professor Higgins?
"How niiice of you tooo let me post"

=== Andy Evans ===
Visit our Website:- http://www.artsandmedia.com
Audio, music and health pages and interesting links.

He's got it, by George he's got it!



Yes and I think I know who I got it from.....

:-)

Hi,

In message , Jim Lesurf
writes

As Steward has already said, I'd expect the 8000S to be fine driving 63's.

Thanks for the confirmation Jim.


FWIW The 63 appeared in various versions, and the input impedance did
change during its manufacturing lifetime. Don't have the details to hand,
but the 'worst' load is probably the earliest version. Early versions also
tend to have the 'push in' loudspeaker terminals.

I'm just finding out about the various incarnations of these speakers. I
suppose I'll just do some research, and try to make sure I get a
reasonably late pair. It seems that most second hand sellers are pretty
helpful with information like serial numbers. Thanks for the
information.

--
Regards,
Glenn Booth

Hi,

In message ,
writes
On Mon, 01 Nov 2004 13:30:49 +0000 (GMT), Jim Lesurf
wrote:

Meridian is the leading advocate of this approach in the field of Hi-fi.

Yes. My regret is that they don't make Electrostatics. ;-)

Have you seen Siegfried Linkwitz's web site?
http://www.linkwitzlab.com/

His open baffle designs look as if they could equal ESLs in most ways
and exceed them in dynamic range capability. The open baffle design
immediately puts them at the same level of ESLs in terms of two of the
ESLs main advantages: no boxy colourations and a figure eight polar
response to reduce room mode excitations.

It's a very good site - lots of useful information. I looked at his
designs a while ago, but they seem quite expensive, even as kits. Were I
in the US I might make an effort to hear some, but it's seems to be
difficult to get in front of a pair in the UK.

--
Regards,
Glenn Booth