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In Reply to: RE: steady 34kHz tone posted by dave789 on May 17, 2015 at 14:35:52
"When I connect Styleaudio Sapphire or Audioengine D1 (both have CS8416), there is 34kHz steady tone
"When I connect MuxLab 5.1ch to 2ch DAC, there is 38kHz steady tone."
I am speculating what the problem might be, but I do have one question.... Is there also a "10 kHz steady tone" in your measurements?
Follow Ups:
10kHz tone is the test tone I used. I played 10kHz 0dBFS track on Pierre Verany Digital Test CD.When there is -4.0 dBFS on the screen capture, it means that the 10kHz sinusoidal tone was fed to A/D converter at the level of -4.0dBFS.
Edits: 05/17/15
"10kHz tone is the test tone I used. I played 10kHz 0dBFS track on Pierre Verany Digital Test CD."
It looks like the 34 kHz "steady tone" you were getting is the first alias (frequency reflection) of the 10 kHz tone about 22 kHz (half of 44.1 kHz sample rate).... The 38 kHz "steady tone" is the first alias of the 10 kHz tone about 24 kHz (half of 48 kHz sample rate).
(You might see other steady tones, at 54 kHz and 78 kHz if you're sampling at 44.1 kHz. And at 58 kHz and 86 kHz if you're sampling at 48 kHz.)
This suggests that no filtering is taking place. None whatsoever. Digital or analog. Most DACs have filtering to block out alias artifacts above half the sample rate frequency. Some non-oversampling DACs that also don't use any analog filtering would have these very same "steady tones" present.
So if your DAC is a non-oversampling DAC that doesn't use any other filtering, these "steady tones" you're getting might actually be normal.
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