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Old 2nd February 2014, 09:31 AM   #21
PMA is offline PMA  Europe
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The difference in capacitances makes less amplitude response deviation than 0.1 dB over 20Hz - 48kHz band between the capacitor channels. Would it be OK?
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File Type: png Roederstein vs Mundorf.PNG (64.6 KB, 132 views)
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Old 2nd February 2014, 09:34 AM   #22
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Default Test files prepared

I have prepared 3 sound files for you, in 48kHz/24 bit. Two files are consequent take from the same capacitors, the third file is recorded through second type of capacitors. I will show you the file statistics now, for you to evaluate amplitude matching of files.
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File Type: png 1.PNG (68.0 KB, 135 views)
File Type: png 2.PNG (67.8 KB, 132 views)
File Type: png 3.PNG (67.3 KB, 130 views)
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Last edited by PMA; 2nd February 2014 at 09:46 AM.
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Old 2nd February 2014, 09:38 AM   #23
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Now I will show you FFT analysis of the difference file between two recordings from the same capacitors. This will show consistency of the replay/recording process, resulting in noise bottom only. Such test is necessary for us to know that we do not evaluate only random errors of the D/A - A/D process used. Which may happen, anyway, but the difference must not create well audible artifacts.
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File Type: png cap1-cap1.PNG (81.3 KB, 135 views)
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Old 2nd February 2014, 09:44 AM   #24
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Now I would like to consult the listening test method. I would like for you to post a screenshot of ABX test, foobar preferably, with minimum of 7 attempts per ABX screenshot. Do you want for me to name the files like mundorf1, roederstein2 for you to know what you hear (it would not help in ABX result at all) or shall the file names stay anonymous and you will try to tell me which is which? Once again I repeat, we have 3 files, 2 of them are through same capacitor, only different recording, third file is from second capacitor.
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Old 2nd February 2014, 09:49 AM   #25
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Quote:
Originally Posted by PMA View Post
The difference in capacitances makes less amplitude response deviation than 0.1 dB over 20Hz - 48kHz band between the capacitor channels. Would it be OK?
It just almost passes your own requirement on level matching for ABX tests

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Old 2nd February 2014, 09:57 AM   #26
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I think blind filenames, not due to be able to identify the actual make, but to take away chance of have being influenced ny marketing etc.

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Old 2nd February 2014, 10:01 AM   #27
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I agree.
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Old 2nd February 2014, 10:17 AM   #28
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Quote:
we shall have some low frequency roll off. Like -2.25dB/20Hz
Seems quite high frequency for a coupling cap into a power amplifier.
What about F-3dB @ ~2Hz?
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Old 2nd February 2014, 10:39 AM   #29
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But it is matched between caps <0.1dB, and it may bring some stress to capacitors at least at very low frequencies.
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Old 2nd February 2014, 10:44 AM   #30
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Default Test files

OK, here are three test files. 2 of them are through same capacitor, only different recording, third file is from second capacitor.

https://www.dropbox.com/s/ce2euq2kq7v3ftz/cap1.wav
https://www.dropbox.com/s/4yjjmcef04ascag/cap2.wav
https://www.dropbox.com/s/kgeiyn17c2v4kix/cap3.wav

I would like to see:

1) an ABX result between 2 of 3 files, posted as a screenshot
2) a guess which 2 of 3 files were recorded through same capacitors (via PM, please)
3) which files are from Mundorf and which from Roederstein (via PM, please)

Anyway, if you post your ABX screenshots according to (1) only, I will appreciate it more than enough.
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Last edited by PMA; 2nd February 2014 at 10:48 AM.
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