peniku8 Posted October 31, 2021 Author Report Share Posted October 31, 2021 Pmillett Sound Card Interface loopback measurements: Measurement chain is Fireface UC → SCI (Generator input) → Internal loopback → Fireface UC The SCI converts the balanced signal of the Fireface internally and outputs either balanaced or unbalanced, which can be switched. It doubles the output voltage, so if I input 2V balanced, it outputs 4V balanced or 4V unbalanced. Voltages seen are after conversion (means the Fireface outputs half the voltage displayed). Measurements are sorted by voltage ascending. The 1V measurement looks similar to the Fireface loopback, so I guess the pmillett isn't adding too much distortion. The pmillett started distorting at about 8.6V output (unbalanced). When I switched it to balanced, the distortion increased a bit, but there was more headroom (presumably twice the voltage). Here is a measurement of the Fireface at 0dbFS, which produced 13,25V at the Pmillett's generator output, which is about 24,6dbU: Quote Link to comment Share on other sites More sharing options...
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