When I started publishing measurement results in ASR, I said that part of my work would be devoted to "double checking" on Amir's measurement results. To avoid a situation where a vendor sends a "golden sample" to ASR
Of course, this part of my work depends on luck. The key is the equipment my friends can provide me, or whether the equipment I buy is measured by Amir.
Amir and I got results within a margin of error in a longer measurement. We followed basically similar temperature conditions and the end results were similar. But the trend is reversed. (The SINAD I have on hand goes up, while Amir's THD + N gets worse). You can see pages 4 and 5 of this post.
At present, the probability of "golden sample" issues is decreasing, while the probability of "thermal issue" is higher.
I have placed an order for a new unit. Please stay tuned.
2019/12/11 Update:
I received the unit I purchased.
Dashboard(Cold room temp=72℉ ):
Long-term testing:At the time I marked, I attached a warm pad to the M500 and covered it with clothes.
The final measurement results match Amir's earlier measurements! It can be considered that the M500 is only an issue in which the measurement result changes greatly with temperature changes.
There is no "Golden Sample"
Just today, I received a SMSL M500 from a friend.
After measurement, I think this is a big problem ... because the measurement results are very different from Amir.
Here are the measurements:
I think I used the same settings as Amir (ASIO4ALL USB 48K, Volume Set to 34 4V Out)
But the measurement results are very different from @amirm :https://www.audiosciencereview.com/forum/index.php?threads/smsl-m500-dac-and-hp-amp-review.9606/
So if there is a chance, I think Amir can try to get another M500 from a third party channel.
I will also try to find another one.
If the "golden sample" is confirmed ...
Update :
Just now I read Amir's post carefully. It was found that his dashboard was using a sampling rate of 44.1KHZ.
To avoid controversy, I did another quick measurement with 44.1KHZ.
Here are the results:
Of course, this part of my work depends on luck. The key is the equipment my friends can provide me, or whether the equipment I buy is measured by Amir.
Amir and I got results within a margin of error in a longer measurement. We followed basically similar temperature conditions and the end results were similar. But the trend is reversed. (The SINAD I have on hand goes up, while Amir's THD + N gets worse). You can see pages 4 and 5 of this post.
At present, the probability of "golden sample" issues is decreasing, while the probability of "thermal issue" is higher.
I have placed an order for a new unit. Please stay tuned.
2019/12/11 Update:
I received the unit I purchased.
Dashboard(Cold room temp=72℉ ):
Long-term testing:At the time I marked, I attached a warm pad to the M500 and covered it with clothes.
The final measurement results match Amir's earlier measurements! It can be considered that the M500 is only an issue in which the measurement result changes greatly with temperature changes.
There is no "Golden Sample"
Just today, I received a SMSL M500 from a friend.
After measurement, I think this is a big problem ... because the measurement results are very different from Amir.
Here are the measurements:
I think I used the same settings as Amir (ASIO4ALL USB 48K, Volume Set to 34 4V Out)
But the measurement results are very different from @amirm :https://www.audiosciencereview.com/forum/index.php?threads/smsl-m500-dac-and-hp-amp-review.9606/
So if there is a chance, I think Amir can try to get another M500 from a third party channel.
I will also try to find another one.
If the "golden sample" is confirmed ...
Update :
Just now I read Amir's post carefully. It was found that his dashboard was using a sampling rate of 44.1KHZ.
To avoid controversy, I did another quick measurement with 44.1KHZ.
Here are the results:
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