Phono Cartridge Response Measurement Script

[USER]

Distortion is starting late in 1k mode. At least on my computer.

 

[Thomas_A]

s

Starting point L -24.44dB, R -35.79dB:

View attachment 273468

My third adjustment was the best I achieved with the Ortofon record, though my target was to optimize on the JVC:

• Ortofon L -31.28dB, R -30.60dB
• TRS-1007 L -27.78dB, R -30.49dB

View attachment 273469

Final adjustment #6:

• Ortofon L -34.43dB, R -29.68dB
• TRS-1007 L -29.68dB, R -29.30dB
• XG-7001 L -28.23dB, R -24.73dB (EDIT - Pilot tones from sweep tracks)
• STR-100 L -19.69dB, -19.85dB
• *EDIT* XG-7001 B Tracks 5 and 6: L -29.95dB, R -29.68dB

View attachment 273472
View attachment 273473
**Note the FR looks strange on XG-7001 as I used RIAA bass emphasis which is not correct for this record.

View attachment 273471

Just a question; how did you adjust it? CW or CCW seen from the front? I am not sure yet if my cartoon for phase and azimuth is correct.

 

[JP]

s

Just a question; how did you adjust it? CW or CCW seen from the front? I am not sure yet if my cartoon for phase and azimuth is correct.

CCW

 

[USER]

Single file plotstyle 1 gives this error (at least for me):

Traceback (most recent call last):

File "C:\Users\Fran\anaconda3\lib\site-packages\spyder_kernels\py3compat.py", line 356, in compat_exec
exec(code, globals, locals)

File "c:\users\fran\desktop\test\jp 16.1.py", line 529, in <module>
lines2, labels2 = ax2.get_legend_handles_labels()

NameError: name 'ax2' is not defined

I know I changed some things so I tried it with a clean copy of the script. The other plotstyles work.

Anyways, there goes my weekend:

 

[JP]

Always breaking shit.

Towards the bottom of "if plotstyle == 1:", change:

else:
            
            lines1, labels1 = ax1.get_legend_handles_labels()
            lines2, labels2 = ax2.get_legend_handles_labels()
            plt.legend(lines1 + lines2, labels1 + labels2, loc=4)

To:

else:
            plt.legend(loc=4)

 

[JP]

Distortion is starting late in 1k mode. At least on my computer.

View attachment 273642View attachment 273643

Hmm. Not sure why this is happening but it'll not have the opportunity when I update the start/endf logic.

 

[JP]

I noticed the filter at 10Hz doesn't appear to be affecting the fundamental plot, it is affecting the crosstalk plot. I'm going to remove that feature as I think it's going to cause far more trouble than it'll solve.

 

[USER]

AT150MLX. Different body but same inductance so it shouldn't matter. This is the lowest high frequency bump I have been able to produce. Seeing that my alignment seems right, this is the best I can do. If these results hold, 50pF total should be perfect, lol.

I am liking this crosstalk feature (on test records like this) as it keeps you honest. It's also a fabulous set-up tool. Not sure if this is the limit on this record, however. Spec is 30dB. I'll try it again when I get the original cartridge body back.

 

[Thomas_A]

Side B of my Clearaudio CA-TRS1007 is different...seems cleaner vs. side A in left channel. But x-talk is poor.

 

[USER]

Side B of my Clearaudio CA-TRS1007 is different...seems cleaner vs. side A in left channel. But x-talk is poor.
View attachment 273830

Looks like they are all like that. Interestingly, our troubled channels are swapped.

 

[ariendj]

I've been playing around with my Denon PCC test record and my AT132/ATN152 combo, trying to get it to do 40dB+ of separation again by means of active compensation. First step is to measure crosstalk as is, of course. But I noticed something weird. LtoR crosstalk was only at around 20dB, while RtoL was about 32, just like it used to be for both channels the last time I measured. I didn't use it for about one year but it did not get damaged. Does anyone have an idea what might cause this? The preamp I use is different than last time, though I can hardly imagine it being bad enough to cause that much crosstalk on only one channel. Pretty odd.

 

[JP]

I thought this was a cool stacking affect. No idea how to control the dust enough for a clean shot.

 

[Thomas_A]

I've been playing around with my Denon PCC test record and my AT132/ATN152 combo, trying to get it to do 40dB+ of separation again by means of active compensation. First step is to measure crosstalk as is, of course. But I noticed something weird. LtoR crosstalk was only at around 20dB, while RtoL was about 32, just like it used to be for both channels the last time I measured. I didn't use it for about one year but it did not get damaged. Does anyone have an idea what might cause this? The preamp I use is different than last time, though I can hardly imagine it being bad enough to cause that much crosstalk on only one channel. Pretty odd.

What was your initial and azimuth-adjusted crosstalk initially?

 

[gumsrave]

This script is fantastic! How are people preparing their wave files from the DENON XG-7001 record? I gather from the thread that they need to be filtered/EQed?

 

[JP]

I've been playing around with my Denon PCC test record and my AT132/ATN152 combo, trying to get it to do 40dB+ of separation again by means of active compensation. First step is to measure crosstalk as is, of course. But I noticed something weird. LtoR crosstalk was only at around 20dB, while RtoL was about 32, just like it used to be for both channels the last time I measured. I didn't use it for about one year but it did not get damaged. Does anyone have an idea what might cause this? The preamp I use is different than last time, though I can hardly imagine it being bad enough to cause that much crosstalk on only one channel. Pretty odd.

The most likely cause is simply that something moved. Maybe the body, maybe the cantilever azimuth?

How are people preparing their wave files from the DENON XG-7001 record? I gather from the thread that they need to be filtered/EQed?

It requires custom bass emphasis. I've not dug in to that yet - I need biquads to implement it.

 

[Thomas_A]

I thought this was a cool stacking affect. No idea how to control the dust enough for a clean shot.

View attachment 273908

Is that white washer your azimuth correction?

 

[JP]

Is that white washer your azimuth correction?

Yes but it’s just some paper.

 

[USER]

First round of CA test record flattening. Nothing too strong. But I think all my results show a tightening up of the some of the harmonics. Ignore the color changes, as this record provides messy results I am playing around with colors that are easier for me to differentiate.

 

[JP]

Use ovrdylim to keep the scale from changing.

 

[gumsrave]

It requires custom bass emphasis. I've not dug in to that yet - I need biquads to implement it.

Thank you. So, should I be seeing a falling frequency response in the graph using default settings, down -10dB from 1kHz to 10kHz? Or is there something else that I’ve messed up?