Topic: ADI-2 Pro artifact near Nyquist frequency
I've just got an ADI-2 Pro AE for measurement purposes and now I am evaluating the device. I use MacBook Pro/Mac OS X 10.11/Logic Pro X. I played a sweep signal and recorded it via analog loopback cable, and found a glitch near the end of the signal. I analyzed the situation and here are my findings:
An artifact occurs near Nyquist frequency. Below is a recording of magnitude-varying 95kHz sine wave, 90kHz is no problem. I get similar results from both output channels of ADI-2 Pro, even if I record them via Fireface UFX, so I think that the problem resides in ADI-2 Pro's output. Changing filter (Slow/Sharp/NOS) does not help.
Before continuing the test, I would like to hear RME's opinion about this.