John Curl's Blowtorch preamplifier

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syn08 said:
Can you expand on this? What copper are you talking about?

I was wrong, I did that comparison with speaker cables not IC's, here are a description of the cables.

In construction, both comprises of 3sq. mm twisted pair, each of 260 strands. These are arranged first in 7 concentric bundles then woven into a precision rope-lay, low dielectric loss polypropylene insulation, cotton damping and soft PVC sheathing.

The one set of cable use "UHP-OFC" and the other "Monocrystal" copper conductors.
 
Andre Visser said:


I was wrong, I did that comparison with speaker cables not IC's, here are a description of the cables.

In construction, both comprises of 3sq. mm twisted pair, each of 260 strands. These are arranged first in 7 concentric bundles then woven into a precision rope-lay, low dielectric loss polypropylene insulation, cotton damping and soft PVC sheathing.

The one set of cable use "UHP-OFC" and the other "Monocrystal" copper conductors.

Are you sure you did not read this "scientific" FAQ before your audition test?

http://www.ecossecables.co.uk/Tables/faqmainframe.html

Check the company store. GBP172 ($250 I guess) for a supa dupa power (mains) cable. GBP170 for a mono RCA cable.
 
Thought experiment:

If one makes a perfectly statistically valid and DBT methodologically correct test, but use a Bose Wave Radio to determine cable differences (or any other thing), are the results valid?

Are the results meaningful?
Can they be generalized?

_-_-bear

PS. substitute some other system for "Bose Wave Radio"... then what?
 
For testing interconnect cables using ABX listening test
you would have to use best possible headphone amplifier
+ best possible headphones

This in order to the distortion from the cables
to be as high as possible in level compared to the rest of system components.

I do not know how big distortion for example 1 m good interconnect has.
But I would be surprised if it isnt levels lower than the best Audio opamps
= OPA637 / AD797 / LME49710

All this to minimize the masking effects,
when very small details is 'drowned' in presens of higher level details
and so can not be perceived by our hearing.
 
syn08 said:
Are you sure you did not read this "scientific" FAQ before your audition test?

I used to think that cable differences are quite small untill a friend gave me a set of "Monocrystal" speakercable to test. I hated him after that. 😀

It was the first time that I've heard the company name, so no I didn't have any knowledge about them or their cables before listening.

Why do cable prices get mentioned when we discuss cable differences? Thats another issue.
 
lineup said:
For testing interconnect cables using ABX listening test
you would have to use best possible headphone amplifier
+ best possible headphones

This in order to the distortion from the cables
to be as high as possible in level compared to the rest of system components.

Yes, you need a decent system to make better cables worthwhile, no need for headphones IMO.

Originally posted by lineup
I do not know how big distortion for example 1 m good interconnect has.
But I would be surprised if it isnt levels lower than the best Audio opamps
= OPA637 / AD797 / LME49710

Good interconnects should have very low distortion yes. 😀

Originally posted by lineup
All this to minimize the masking effects,
when very small details is 'drowned' in presens of higher level details
and so can not be perceived by our hearing.

I disagree with the "masking effect" theory, it must have been invented with AC3 coding and we all know that, that is not hi-fi.

It is easy to hear ambience and smaller sounds even when some instruments play quite loud. I believe they have come to their conclusions with noise, not well recorded stereo music.
 
bear said:
Thought experiment:

If one makes a perfectly statistically valid and DBT methodologically correct test, but use a Bose Wave Radio to determine cable differences (or any other thing), are the results valid?

Are the results meaningful?
Can they be generalized?

_-_-bear

PS. substitute some other system for "Bose Wave Radio"... then what?

Bear, results of every experiment at first only valid under the specific conditions of this particular experiment.

If you want to generalise the results in certain aspects then you´ve to show, that in these points the conditions of the experiment were so, that generalisation is scientific reasonable.

That´s why documentation is needed and why the use of controls is mandatory.
 
bear said:
Thought experiment:

If one makes a perfectly statistically valid and DBT methodologically correct test, but use a Bose Wave Radio to determine cable differences (or any other thing), are the results valid?

Are the results meaningful?
Can they be generalized?

_-_-bear

PS. substitute some other system for "Bose Wave Radio"... then what?

Some clowns have shown with their simulator 😱 that there are measureable differences with different cables between different amplifiers and speakers but their verdict was that cables have no influence on the sound. :smash:
 
That is because they are stuck with the 'impossibility' that cables make a difference. Same thing happened to Galileo: "Jupiter's moons are invisible to the naked eye and therefore can have no influence on the earth, and therefore would be useless, and therefore do not exist" Francisco Sizzi (Professor of Astronomy) 1610 Minds have not changed much, just different subjects.
 
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