New webpage on loudspeaker cables
 

Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Jim Lesurf wrote:
Rob wrote:
Jim Lesurf wrote:

FWIW it means very little to me. You seem to assume a correlation
between frequency, resistance and sound.

Not sure what you mean, I'm afraid.

That much is apparent. Doubt you know much about the concept at all, nor the
bases of stability.

Can you explain then? It has me puzzled too. And given Jim's
background I am going to tell you he knows precisely what stability
means, and how to measure and predict it.

How many amps has Jim designed that have sold in the many tens of thousands ? And
been VERY reliable.

I don't see any relevance in this answer.

Practical knowledge of how to do it and get it right.

So, how many amps has Jim sold commercially ?

Graham


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New webpage on loudspeaker cables
 

David Looser wrote:

"Eeyore" wrote
David Looser wrote:

I wonder why it is that some people on this NG post simply to be
offensive to others? Of *course* Jim knows the basis of stability, at
least as
well as you do, probably a lot better.

Not if he thinks the answer belongs in the CABLE ! That's pure humbug.

But then he doesn't, he was showing that different cables present different
loads, and will thus have different effects on potentially unstable
amplifiers.

So your point was?

Don't buy or use potentially unstable amplifiers. This was more of an issue
about 30 years ago.

Graham


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Ian Iveson wrote:

Jim Lesurf wrote:

I've just put up a new webpage that provides some
measurements on the
properties of a variety of loudspeaker cables. The page is
at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi
Fi News' a few months ago.

Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables
immediately. With the old Maplin leads, *anything* might
have been happening. After all, some amplifiers have some
problems with some other cables, and since we don't know
which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids,
just to be sure.

For once I can side with you Ian ! ;~)

Graham


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Phil Allison wrote:

"Ian Iveson"
Jim Lesurf Criminal wrote:

I've just put up a new webpage that provides some measurements on the
properties of a variety of loudspeaker cables. The page is at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi Fi News' a few
months ago.


Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables immediately. With
the old Maplin leads, *anything* might have been happening. After all,
some amplifiers have some problems with some other cables, and since we
don't know which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids, just to be sure.

** That is almost funny.

Academic ****s like this " Jim Lesurf " character are a POX on the face of
the earth.

They think and write in a social vacuum, with a criminally reckless
disregard for the obvious consequences.

Other examples include:

1. Matti Otala , who did ENORMOUS HARM with his asinine, phoney " TIM
" bull****.

2. Walter Jung and Richard Marsh, who did ENORMOUS HARM with their
witchcraft like approach to using capacitors.

Both the above played RIGHT INTO THE SLIMY HANDS of a small army of
*scumbags and charlatans* who were just WAITING to exploit the fake
credibility these pukes writings provided them with.

Plus and as a DIRECT result, many honest and thoroughly expert designers
& makers of audio gear, all round the world, were almost or actually put out
of business.

PLUS:

Any IMBECILES who purchase audiophool speaker cables DESERVE to have
their stupid, audiophool amplifiers BLOW UP !!!

Only that might put the vile, cable scammers out of business.

.... Phil

You have my 100% agreement again. Is Jim Lesurf one of those out-of-touch
academics that never have to build a product that has to work in the real world
?

Graham


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New webpage on loudspeaker cables
 

"Dave Plowman (News)" wrote:

As usual you have jumped straight in without reading and digesting the
article.

The effect of pure shorts and opens is an ASININE concept, completely out of
touch with the real world.

Graham

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Jim Lesurf wrote:

Eeyore wrote:

Jim Lesurf wrote:

In general, cable losses will reduce the amplitude in the presented
impdance changes with frequency in the RF region.

How good are your ears at 1MHz ?

Afraid I can't hear 1MHz. But I have heard - and measured - a change in
amplifier performance in cases where the amp has been producing bursts of
oscillations at such frequencies with loads it did not like at RF.

I can believe that.


As before, I am quite surprised that someone who I thought had designed and
tested amp may not have encountered this.

I have and I know how to avoid it. I fail to see the point of an article
designed to promote cables for badly designed ( marginally stable ) amplifiers.
Simply junk the useless amp.

Graham


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New webpage on loudspeaker cables
 

On Thu, 13 Aug 2009 17:18:35 +0100, Eeyore
wrote:



Don Pearce wrote:

Eeyore wrote:
Don Pearce wrote:
Eeyore wrote:
Jim Lesurf wrote:
Rob wrote:
Jim Lesurf wrote:

FWIW it means very little to me. You seem to assume a correlation
between frequency, resistance and sound.

Not sure what you mean, I'm afraid.

That much is apparent. Doubt you know much about the concept at all, nor the
bases of stability.

Can you explain then? It has me puzzled too. And given Jim's
background I am going to tell you he knows precisely what stability
means, and how to measure and predict it.

How many amps has Jim designed that have sold in the many tens of thousands ? And
been VERY reliable.

I don't see any relevance in this answer.

Practical knowledge of how to do it and get it right.

So, how many amps has Jim sold commercially ?


How many marginally stable amps have you designed? I'm betting you
have no idea, because your technical description of how to get it
right in another post was utterly wrong. It is clear that not only did
you not understand the mechanisms involved, but your approach was
simply design and hope (I suspect application notes and cookbooks
figured largely).

d

New webpage on loudspeaker cables
 

"Eeyore = Graham Stevenson = a total **** "


Don't buy or use potentially unstable amplifiers.


** Potentially unstable is an epithet that applies to just about every
amplifier and every person ever made.


This was more of an issue about 30 years ago.


** Don't you just love pommy ****wits who never actually state what they are
falsely alluding to ??

Text book symptom of rampant, congenital autism.

Dead give away - really.




..... Phil

New webpage on loudspeaker cables
 

In article , Eeyore
wrote:


"Dave Plowman (News)" wrote:

As usual you have jumped straight in without reading and digesting the
article.

The effect of pure shorts and opens is an ASININE concept, completely
out of touch with the real world.

Thanks, Eeyore. :-) You have just confirmed that you haven't understood
that their use is part of a standard *practical* technique for impedance
measurements. That largely explains your failure to understand the content
of the article.

I have already tried repeatedly to explain this to you, but I think I can
now conclude that - so far as you are concerned - this was a waste of time.
So I can save the effort of trying to explain it to you again.


Slainte,

Jim

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Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
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New webpage on loudspeaker cables
 

In article ,
Eeyore wrote:
You have my 100% agreement again. Is Jim Lesurf one of those
out-of-touch academics that never have to build a product that has to
work in the real world ?

I'll answer for Jim in case he's modest. He designed a variety of amps for
Armstrong which were very well regarded. I had experience of a tuner amp
which sounded very good indeed.

What well regarded commercial designs are you responsible for?

--
*It IS as bad as you think, and they ARE out to get you.

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