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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old 26th May 2019, 09:42 AM   #20001
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by Max Headroom View Post
Yes, try listening to some silver cable and you may 'discover' something for yourself.
I now have loopback recordings that illustrate this 'brightness', who cares what 'theory' says when the facts are clear.


Dan.
I've got some silver plated wires, does that count?
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Old 26th May 2019, 09:59 AM   #20002
indra1 is offline indra1  Indonesia
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Originally Posted by scottjoplin View Post
I've got some silver plated wires, does that count?
Try Specialist in craft wire, knitted craft wire, silver wire, enamelled copper, resistance wires, stainless steel, plated wires and many more!, they have the pure 99.99% soft and sterling 925. Use 2-3 feet length for listening tests.
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Old 26th May 2019, 09:59 AM   #20003
PMA is offline PMA  Europe
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Originally Posted by Max Headroom View Post
So a couple of files were bunky but not fatally, so what ?.
So what? Just that we are evaluating the flaws of your system and not the supposed wire material sonic influence. That is the tragedy of most audiophiles, because of their incompetence they have serious flaws in their systems which they attribute to some magic unknown material properties or phenomena. Just because of their incompetence and ignorance. That is the real case, together with psychoacoustic effects.
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Old 26th May 2019, 10:04 AM   #20004
KSTR is offline KSTR  Germany
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Time to repeat these questions as there have been only very vague answers so far from the few here that did bother to respond.

Quote:
Originally Posted by KSTR View Post
I would like to pose a few questions to the cable specialists:

1 - Any known very directional wires/cables one can buy or easily build from scratch?

3 - Would directionality (the direction A vs B difference) typically be an error closely correlated to the signal, that is, not random enough to be reduced considerably by precise time-domain averaging which is used as a method to dig down deep in the uncorrelated noise?
Note that correlated noise signatures (like excess current noise from mediocre resistors) still appear in spite of the heavy averaging (on the order of 10,000 blocks of sample data, typically).

2 - Would directionality appear in cable loopback with an integrated single DAC/ADC device, that is, when freed from many typical other noise/error sources like RF ingress and balancing currents?


I'm asking because I'm in a process of constantly refining my measurement strategies and time-domain averaging techniques enabling a view down at least some 40dB below the analog noise floor in the signal and especially in diff test residuals, having a virtual analog resolution of around 30bits. With a fully arbitrary test signal, actually.

So if (at least some) cable directionality effect is real and fulfils the above criteria (and maybe others?) it should be possible to measure and quantify under very real working conditions with "real" signals (to avoid any potential pitfalls of steady-state type of measurements), should't it?

Point is, it's an almost ideal candidate to exploit the power of differential testing because "standard" linear/nonlinear phenomena should remain unchanged. No trimming or post-processing needed to empirically match gross changes (like from different cables) which greatly increases robustness of the method. Some special care is needed though, for the automatic switching matrix that is required to implement this (still under construction).
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Old 26th May 2019, 10:10 AM   #20005
PMA is offline PMA  Europe
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Quote:
Originally Posted by KSTR View Post

2 - Would directionality appear in cable loopback with an integrated single DAC/ADC device, that is, when freed from many typical other noise/error sources like RF ingress and balancing currents?
Klaus, let me be not very serious and pick just one of your questions .

No, in the loopback arrangement and ABX test there will be no effect, because the subject does not know which recording is which

-or-

yes, because the system used is so poor that it is unable to yield same signal data for the two runs of the same file
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Old 26th May 2019, 10:18 AM   #20006
scottjoplin is offline scottjoplin  Wales
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Originally Posted by indra1 View Post
Try Specialist in craft wire, knitted craft wire, silver wire, enamelled copper, resistance wires, stainless steel, plated wires and many more!, they have the pure 99.99% soft and sterling 925. Use 2-3 feet length for listening tests.
Wow, don't let Dan see this site, he'll be like a kid in a candy store.
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Old 26th May 2019, 10:25 AM   #20007
chris719 is online now chris719  United States
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Quote:
Originally Posted by Max Headroom View Post
You have no real clue about audio or the results that I am achieving. So a couple of files were bunky but not fatally, so what ?. You have not indicated that you have auditioned any of the other loopback recordings, suggest a track you know and like and I will process it for you. My next round of loopback recordings should capture directional effects and stand as proofs. Then we can debate the causes, in the meantime you could try reversing one interconnect and try the experiment for yourself, that is if you have a stereo worth listening to (IIRC you have a little Bose satellite system, is that right ?).

Dan.
This is not the right way to measure noise. Not that it matters, because your theory is crazy and you said it could be heard with a Samsung phone, but I don't have a Bose system. I have Sennheiser HD800s and Dynaudio monitors.
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Old 26th May 2019, 10:36 AM   #20008
indra1 is offline indra1  Indonesia
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Originally Posted by KSTR View Post
... 1 - Any known very directional wires/cables one can buy or easily build from scratch?...
Maybe Mr. Colburn or Mr. Hoyt can help a bit more?
Quote:
Originally Posted by wayne View Post
I have had cable directionality demonstrated to me as a measurement. It was due to poor cable design and construction. I don't know if it was audible or not but it could be measured and was also position dependent.
Quote:
Originally Posted by hhoyt View Post
... Connector contact resistance is very highly variable, especially with poor connectors like RCA plugs and represents a swamping variable in the test. In our many audio systems in the cassette and optical disc plants we had to constantly clean and maintain both BNC and XLR connectors which could variously show a level drop, rectification artifacts or intermittent noises.
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Old 26th May 2019, 10:37 AM   #20009
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Originally Posted by scott wurcer View Post
I always love how these valve amps have mains IM on every input signal at 30dB over the noise floor.
However, I do not think that it is a necessary behavior of the tube amp design.
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File Type: png tube_imd.png (73.5 KB, 185 views)
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Old 26th May 2019, 11:08 AM   #20010
Tournesol is online now Tournesol  Belgium
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Originally Posted by vacuphile View Post
Since it is such a non-issue for audio, the use of the word 'dispersion' in acoustics is generally (and thus, correctly) used to describe the 3D characteristics of a loudspeaker. These, as we all know, are heavily impacted by frequency.
I have not followed all of this semantic debate, but, in my language, we use the word "directivity" rather to speak of the distribution of the sonorous power of a speaker in space, and the word dispersion to speak of the way the surfaces that obstruct sound waves ... reflect them in space.

In optics, a perfect mirror has 0 dispersion, if I do not mistake, a matte wall reflect and disperses a ray of light in all directions. Likewise, a flat rigid wall has 0 dispersion, an irregular surface wall in relation to the considered wavelength acts like the dull wall.

In any case, by striking an obstacle, and depending on the rigidity of the wall, part of the sound waves are absorbed, and transformed into heat.

There is also a dispersion due to the transmission media itself, the air in our case, which varies with the humidity, just as the mist attenuates and disperses the light rays.
A solid media transmits sound waves like a waveguide.
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Tryphon Tournesol

Last edited by Tournesol; 26th May 2019 at 11:10 AM.
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