@amirm do you plan on doing any other measurements on the Behringer?
At least one I would like to see is the -4 db of white noise in a 44.1 or 48 khz file recorded at 192 khz. That will confirm the FR is basically flat over the first 20 khz, and if combined with a 19 khz tone overlay it will show us the steepness of the filter and whether it does a good job of keeping out aliasing. Here is one for the HDMI switcher this one is 48 khz so I used a 20 khz tone.
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I actually find combining the white noise trace and silence with a portion of a sweep to makes it easier to see what is reflection/aliasing around the sample rate and what is a spurious idle tone. Here is the same graph only I used an FFT of a small portion of a slow 20-20 khz sweep. The noise floor is modulated by the below 20 khz signal even out to nearly 80 khz.
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For comparison here is a Tact RCS 2.0. You see less modulation of the noise floor. You also can see several idle tones which actually were in the ADC.
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