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Phono Cartridge Response Measurement Script

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JP

JP

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jjbunn

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Ya as @VinyLuke said riaamode 3 and inverse 1 is what you want.
Thanks, JP!

Here is what I measure for a Soundsmith SMMC4, a rather good cartridge with less than 50 hours play time on it, VTF=1.2g.

Do the results look good or bad or indifferent?

What is the likely cause of the uneven response between 10kHz and 20kHz?

I have a bunch of cartridges to test, but don't want to contribute results to the library thread if my measurements are faulty.

SoundSmith SMMC4 (1.2g)_140pF + 100pF_CBS STR 100 (1961).png
 

Balle Clorin

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I would say you need A Clearaudio TRS-1007 test record , your CBS seems worn out
 
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What’s that based on?
 

Balle Clorin

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shaky and uneven response at «low «frequency and the same high end sharp peak on two different cartridges.
Left and right channel move more than I am used to see.
And the it is the age 1961. VTA was different then , could be a problem for newer cartridges…?
 
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jjbunn

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shaky and uneven response at «low «frequency and the same high end sharp peak on two different cartridges.
Left and right channel move more than I am used to see.
And the it is the age 1961. VTA was different then , could be a problem for newer cartridges…?
I'm going to try making a measurement with the same cartridge but mounted on a different turntable. That would eliminate the table/arm being the source of those anomalies. I'll report back ... thanks for the help so far!
 

jjbunn

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I'm going to try making a measurement with the same cartridge but mounted on a different turntable. That would eliminate the table/arm being the source of those anomalies. I'll report back ... thanks for the help so far!
Here is a measurement of the same cartridge (Soundsmith SMMC4) but in this case mounted on a B&O Beogram 1800. Using the same test record. Compare with the plot in Post #982 above. For some reason there is no data above 18kHz in this run - perhaps I trimmed the data too aggressively, although I was very careful.

Would welcome some interpretation of the differences, as I'm out of my depth :)


SMMC4 (1.2g) on Beogram 1800 _??pF + 100pF_CBS STR 100 (1961).png
 

Balle Clorin

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??ValueError: The length of the input vector x must be greater than padlen, which is 12.
 
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Issue with your file - the FFT is missing frequencies usually because they’re not there or the signal is too low.
 

Balle Clorin

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AT-OC9MLII ,What is going on here? I am loosing parts of the crosstalk plot. In the signal too low maybe, recording flat at even 72gain did not recover crosstalk, Should I try recording with RIAA EQ next?
1711604981516.png




1711605179885.png
 
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JP

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No way for anyone to investigate without the audio.
 

Balle Clorin

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Redid it with RIAA active and configured script accordingly , and crosstalk appears all the way. I suspect it has to do with the level of the signal that can be detected.
 
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