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danadam

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  1. I have an impression that may be not enough, as: sounds like challenging people just trying to have fun. I've heard it is frowned upon here 😉
  2. Aside from some weird construct I don't know about, no. DACs and microphones are USB Devices and they need a USB Host, e.g., a computer, to work. The host initiates all the communication.
  3. So neither of these is the original recording? What was the max level in the original recording then? (or in another words, by how much did you increase the volume?)
  4. That's interesting interpretation. Mine is, that by setting such cutoff he just wanted to filter out those that might be 'deliberately or unintentinally "defective"', not that he considered all of them to be defective.
  5. PDF from the author's page: http://boson.physics.sc.edu/~kunchur//papers/Audibility-of-cable-pathways--Kunchur.pdf
  6. My "huh" was mostly about the "+" in your "+32768". First, unless we are talking about some exotic encodings, the limit for positive values in signed 16 bits is +32767. Second, the sample in the file (after converting to 16 bits) is "-32768", which is the limit for negative values.
  7. Yeah, but it is a link directly to an image, not to a post, so I'm not sure if they'll be thrilled about it 🙂
  8. Huh? There is only one sample that reaches full scale and it is the 16'889'889 sample in the left channel of the second file: ]$ hexdump --skip $((44+16889889*6)) --length 6 --format '6/1 "%02x " "\n"' "Melle - Running out of Time2.wav" 00 00 80 18 82 d9 0x80 00 00 is -8'388'608 and it is a perfectly valid value. Mapping to 16 bits gives 0x80 00, which is -32'768, which is also a perfectly valid value. Obviously it is a peak sample in that file. A corresponding sample in the first file is also a peak sample in that file and it is: ]$ hexdump --skip $((44+16889889*6)) --length 6
  9. Are you suggesting that Stereophile has control over superbestaudiofriends.org servers? 😉 (to be clear, I'm not saying that lack of such control is an excuse to threaten for linking)
  10. Also, to be clear, it is not just a simple volume change between the two examples, because otherwise reverting it should get a perfect null and that is not what happens. For example, here's how you can get a similar null. Take the first track, reduce it gain by 19 dB and then normalize to 0 dBFS. The null between 1 and our new track has: Overall Left Right Pk lev dB -85.78 -85.78 -86.11 RMS lev dB -102.19 -101.55 -102.93 RMS Pk dB -92.68 -92.68 -94.16 RMS Tr dB -130.31 -130.30 -130.31 Window s 0.050 Which is very similar
  11. Interesting. That's not what happens for me (i.e. I don't get perfect cancellation) when using SoX or Audacity. Also statistics in ffmpeg show different levels between the two: ]$ ffmpeg -hide_banner -i "Melle - Running out of Time1.wav" -af astats -f null /dev/null ... [Parsed_astats_0 @ 0x559ba517e000] Overall [Parsed_astats_0 @ 0x559ba517e000] Peak level dB: -0.000443 [Parsed_astats_0 @ 0x559ba517e000] RMS level dB: -16.400792 ]$ ffmpeg -hide_banner -i "Melle - Running out of Time2.wav" -af astats -f null /dev/null ... [Parsed_astats_0 @ 0x5570e1947640] Overall [Parsed_astats_0 @ 0x557
  12. The difference between two levels in dB is not the same as the level of their their difference in dB. For example, if 0 dBFS is 1.0, then 1 dB less, -1 dBFS, is 0.891. The difference, 1.0 - 0.891, is 0.109, which in dB is -19.25 dBFS. So both are true, the difference between the levels of those examples is 0.0004432 dB and the level of their null (peak level to be precise) is -85.82 dBFS.
  13. Sound the same to me. I'd say the second one is the first one that was peak normalized to 0 dBFS. So it is about 0.0004432 dB louder 🙂 The diff between the first one and the second one has: Overall Left Right Pk lev dB -85.82 -85.82 -86.20 RMS lev dB -102.29 -101.65 -103.03 RMS Pk dB -92.78 -92.78 -94.26 RMS Tr dB -129.57 -129.53 -129.57 Window s 0.050 The diff between the normalized version of the first one and the original second one has: Overall Left Right Pk lev dB -114.39 -114.39
  14. So something like this?:
  15. It is merged now to the previous thead: CUTTHIS_audiosciencereview.com/forum/index.php?threads/mqa-deep-dive-i-published-music-on-tidal-to-test-mqa.22549/post-795573
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