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In the Forum: Analog Playback
In the Thread: The Foolishness of Analog People
Post Subject: Polar plots programmePosted by N-set on: 11/10/2012
 Romy the Cat wrote:
Actualy I did not take the pinkfishmedia analysis too serious. I have absolutely no idea how to interpret the results of the analysis.

No one really knows at this stage (the tool is very new), apart from the obvious fact that 16 or 17 times per revolution there happens some strange notch. The instability is very peculiar and perhaps is a test LP artefact. Would be nice to redo the plot with some known test LP (Ultimate Analog has been much studied at pinkfishmedia and I recon is well known to Paul). Any chance for that Smile? Do you also know how many motor shaft rotations it takes
for one full platter rotation?

 Romy the Cat wrote:
The reality is that neither I nor the pinkfishmedia guy knows what in TT responsible for it Sound. The solution they use to measure speed instability is very elegant and I do not question it but I do question what it all means. We can measure very objectively harmonic distortion of amp for instance but we know that lower number of distortion is not necessary an assurance of better sound.  The problem, as I see it, that to make the pinkfishmedia analysis better it would take to perfect the analysis itself but not to perfect a turntable.  I would like to see actions over TT that would improve the pinkfishmedia analysis and parallel to it would improve auditable Sound.

This very programme: correlation between the speed instability portraits and the Sound is something I very much hope would eventually be happening!
As a very primitive example, with no pretensions to be anything serious, I tried my deck with two different idlers and Paul kindly provided the plots.
The idler with lower fundamental beat but higher harmonics sounded less stable than the one with higher fundamental but almost no high order harmonics.
Hard to say which plot as "better", I think there is way too little data and correlations to give meaning to this word.

But patience, the harmonic spectrogramms have been around for decades, this tool has only a few years. I hope that this "distributed computing" with multiple people trying to correlate what they hear to the polars will eventually start bringing up some picture of the subject.

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