This is frequency response from Output 2 to Input 2, measured with 'Loopback as timing reference' only. No calibration files loaded.
I assume that this will - or at least should become calibration data with some scaling for measuring with 'Loopback as cal and timing ref'.
But it is not...
Unchecking avoids radical error, but there is still ~2.5 dB uncompensated at 20 Hz (ea25), and response at LF does not look exactly minimum phase. It's not very severe because visible error starts ca. 1 oct. below protection HP filters' -3 dB point. Just for comparison, ARTA leaves ~2 dB smaller...
One on the main purposes of "Use loopback as cal and timing reference" is possibility to provide protection for fragile DUTs with either passive (capacitor) or active high-pass filter in the signal path. Purpose of "loopback as cal..." option is to eliminate effect of high-pass filtering from...
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