Next I tested 14 Khz tone using 48 Khz:
View attachment 5378
Good grief! Clearly neither SIGNSTEK or FiiO have proper 48 Khz clock. SIGNSTEK's distortion products are just 50 db below its signal peak!
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I found this quite shocking, as I had no idea the performance of such devices could vary so much between 44.1 and 48 kHz. Out of curiosity, what makes you say that this is distortion is specifically caused by running these devices at 48 kHz? I mean, between the measurements at 11.050 kHz @44.1 kHz, and 14 kHz @48 kHz, two variables have changed: the frequency of the test signal, and the sample rate. What makes you say the horrible distortion is caused by the latter and not the former? I'm asking because I'd like to come up with a test methodology that covers such pathological behaviour.
between the measurements at 11.050 kHz @44.1 kHz, and 14 kHz @48 kHz, two variables have changed: the frequency of the test signal, and the sample rate. What makes you say the horrible distortion is caused by the latter and not the former?
What is that artifacting beyond 5K on the red channel ? I'm curious.
Can you get an impulse response or an idle channel noise measurement ?
What is that artifacting beyond 5K on the red channel ? I'm curious.
Can you get an impulse response or an idle channel noise measurement ?
What is that artifacting beyond 5K on the red channel ? I'm curious.
Can you get an impulse response or an idle channel noise measurement ?