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Measurements of Matrix Audio X-SABRE Pro
- Thread starter WolfX-700
- Start date
Alan S
Member
ESS IMD hump fixed in MQA version.
Anyway, bad to see this "old friend".
Anyway, bad to see this "old friend".
OP
- Thread Starter
- #3
But the MQA version did not perform well in the Multitone test...
Alan S
Member
一波既平，一波再起。。。
OP
- Thread Starter
- #7
Higher than 6.67K, you will not see the third harmonic. Above 10K, you will not see the second harmonic
OP
- Thread Starter
- #8
I believe this is related to the FFT settings.
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- May 21, 2019
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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?
August
Active Member
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- May 4, 2019
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其实只损伤了一点多音性能，仍然比绝大部分dac强
OP
- Thread Starter
- #11
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.
OP
- Thread Starter
- #12
很强是没有错啦 只是这按下葫芦浮起瓢……
The 22khz bandwidth.
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
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.
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.
The current setup is very good you don't need to change it.
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.
Parameters which do not work well should be changed to work better - by all.
I wonder how the XSPDIF-2 via i2s interacts with the matrix pro, i think matrix audio themselves, or at least a dealer of theirs mentioned that it will further improve performance, and that the sound is better when fed with XSPDIF-2 with these settings, Jitter reducer off, Sync mode, and MCLK dip-switch set to ON so that the master clock fed is the one located inside XSPDIF-2.
If there actually is a difference i expect it to be because of the LVDS port which is galvanically isolated.
If there actually is a difference i expect it to be because of the LVDS port which is galvanically isolated.
