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In Reply to: RE: How is Archimago's equipment not "up to the task"... posted by Dave_K on February 01, 2016 at 14:21:08
"If the difference on playback between an MQA enabled DAC and a non-MQA DAC is greater that -70 dB, then one or the other is broken!"
Who ever said that?
I think what Archi measured should be visited before passing comment, don't you think that would be wise?
Follow Ups:
In the case of the -77 dB result, there was no measurement, just a diff of the digital files.
If I understand the process correctly, MQA encoding as described in the AES paper should be transparent to at least the 16 bit level. So the differences between the clips Archimago compared are almost 20 dB higher than they should be. I can think of a few possible reasons why:
a. The MQA encoded file is not sourced from the same master as the original offered for comparison, in which case it's not a fair comparison.
b. The MQA encoded file was doctored in some way prior to encoding, in which case it's not a fair comparison.
c. The MQA process is not as transparent/faithful to source as claimed.
Other possibilities:
- Diffmaker's results are not reliable
- for instance, it's known that the first 200mS at the start & end of the files being compared causes unnaturally high difference values - an edge effect
- Diffmaker is particularly sensitive to phase differences
- it's really impossible to use Diffmaker to evaluate the audible difference between two files
I'm leaning against blaming Audio Diffmaker because it looks like he selected an appropriate clip and you can actually see a difference in the spectrum plot.
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