Are you still planning on measuring the other 2 filter settings?I confirmed that the firmware was the problem as Coax input was fine. I upgraded to the "A" revision and the but is gone and there is significant improvement in two measurements:
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The only odd thing is that maximum output dropped to 4.77 volts. SINAD in the dashboard remains the same as 119 dB but max SINAD is now 121 dB. @gustard, was this level supposed to happen? I am using the new ASIO driver that I had to install for the firmware. Before I was using Windows class driver.