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You could look here for the aliasing behavior of the ADC I've been using.
https://www.audiosciencereview.com/...aring-aliasing-in-three-adcs.3272/#post-80806
The Zen Tour has aliasing around -88 to -90 dbFS with a Max ultrasonic signal. Of course this aliasing drops if the ultrasonic signal drops. Otherwise at least up to the 96 khz bandwidth I can check it has no surprises. The ESS9038 seems well behaved from what I've seen past the nyquist rate.
Miska checks on up for signals in the megahertz region. I've seen some of what he checks. I'm not convinced it is something that has consequences to us listening to music. But some DACs are not well behaved up there. Miska has pointed out recording the output of the DAC with an ADC filters out ultrasonics that would otherwise be present. So in effect it cleans up any such effects that might cause issue with the rest of the electronics in the chain. A wide bandwidth power amp or feedback loops on class D some such could conceivably be effected. So listening to my recorded files wouldn't be identical to listening to the DAC itself due to this filtering. I believe he suggests it would be best to record 44.1 material at least out to 384 khz sample rates. I don't have any ADCs that run above 192 khz. I could record at 192 to get some of it.
As has been said, people aren't having an easy time hearing differences in 8th and original. The original playback will have whatever ultrasonic artifacts are present in the listener's gear. My 8th gen copies will have that too even if they don't have the artifacts the March DAC itself has. You would be recording the compounding effects of distortion, noise, uneven FR effects, and jitter. Perfect it is not. I can even hear the 8th gen copies, but not easily. I can't hear 1st gen copies as different vs the original.
https://www.audiosciencereview.com/...aring-aliasing-in-three-adcs.3272/#post-80806
The Zen Tour has aliasing around -88 to -90 dbFS with a Max ultrasonic signal. Of course this aliasing drops if the ultrasonic signal drops. Otherwise at least up to the 96 khz bandwidth I can check it has no surprises. The ESS9038 seems well behaved from what I've seen past the nyquist rate.
Miska checks on up for signals in the megahertz region. I've seen some of what he checks. I'm not convinced it is something that has consequences to us listening to music. But some DACs are not well behaved up there. Miska has pointed out recording the output of the DAC with an ADC filters out ultrasonics that would otherwise be present. So in effect it cleans up any such effects that might cause issue with the rest of the electronics in the chain. A wide bandwidth power amp or feedback loops on class D some such could conceivably be effected. So listening to my recorded files wouldn't be identical to listening to the DAC itself due to this filtering. I believe he suggests it would be best to record 44.1 material at least out to 384 khz sample rates. I don't have any ADCs that run above 192 khz. I could record at 192 to get some of it.
As has been said, people aren't having an easy time hearing differences in 8th and original. The original playback will have whatever ultrasonic artifacts are present in the listener's gear. My 8th gen copies will have that too even if they don't have the artifacts the March DAC itself has. You would be recording the compounding effects of distortion, noise, uneven FR effects, and jitter. Perfect it is not. I can even hear the 8th gen copies, but not easily. I can't hear 1st gen copies as different vs the original.