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Measurements of Matrix Audio X-SABRE Pro

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#6
One dumb question, in Amirm testing result, the 32 tone result in low frequency(20hz), it's about 130db, in your measurement, it's 110db, I mean amirm's result is at least 10db better than yours. Why?
 

WolfX-700

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#7
What happened in the THD vs. freq test?
Higher than 6.67K, you will not see the third harmonic. Above 10K, you will not see the second harmonic
 

WolfX-700

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#8
One dumb question, in Amirm testing result, the 32 tone result in low frequency(20hz), it's about 130db, in your measurement, it's 110db, I mean amirm's result is at least 10db better than yours. Why?
I believe this is related to the FFT settings.
 

pozz

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#9

WolfX-700

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#11
So there is rising overall distortion/noise, but then those H2 and H3 readings disappear? Is this an issue with the settings? The same is not visible in: https://www.audiosciencereview.com/...bre-pro-mqa-best-audio-dac-in-the-world.8729/

What FFT size are you using?
In that test Amir used 90KBW (so keep H2, H3 to high frequency).
I will do it again tomorrow with the same standards.

I am a bit confused about some of the settings of the Multitone test. I need some time to learn how to use it.
 

LTig

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#14
In that test Amir used 90KBW (so keep H2, H3 to high frequency).
I will do it again tomorrow with the same standards.

I am a bit confused about some of the settings of the Multitone test. I need some time to learn how to use it.
These are the parameters of @amirm's tests I have assembled so far (maybe @amirm can fill in any missing data):
  • Dashboard: THD samplerate=44.1 kHz, signal = 1kHz 24 Bit 0dBFS dithered, FFT=32k averages=3
  • Jitter: samplerate=48 kHz, JTest signal 24 Bit, FFT=256k? averages=8
  • Multitone 32: samplerate=192 kHz, signal 24 Bit: FFT=256K averages same as jitter? (I use 32)
  • IMD vs level: 48 kHz?
  • DAC reconstruction filter frequency response: signal=white noise, samplerate input > samplerate output, FFT=32k, averages=32 or much more
You should change your dashboard to the settings shown above. Currently your FFT size and averages are too high (the noise floor disappears below the graphic) and the dashboard cannot ve compared visually with @amirm's or my measurements.

Since I have no AP I've created the multitone-32 test signal by myself (I have a DIY command line tool which creates WAV files) and play it with VLC-Player (Linux) or foobar2000 (Windows) while catching the results of the DUT with REW.
 

JohnYang1997

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#15
Why use the same parameters? We need some varieties in the measurements. And 20/22khz bandwidth in much more meaningful than 90khz. Using 90khz is like: hmmm we can't see harmonics after 20khz causing thd to drop after 7khz so lets add more noise so that we can't see any distortion!
The current setup is very good you don't need to change it.
 

JohnYang1997

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#17
For comparison. You can still add measurements with other parameters as well but the standard tests should be standardized. Especially when models are retested. Otherwise people can claim that ASR measurements are invalid because they are not consistent.
One person should have consistent measurement parameters yes but he doesn't need to follow amir's parameters. Especially when some parameters are not working very well.
 
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#18
I would actually like to see a measurement around 900khz ESS sabre usually has a spike around there according to diyaudio forum.
 
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