Update, yes they are active.
So I can test the "STEREO OUDIO OUT" and the FL & FR outputs, and I did that with my test CD (16bits, obviously).
View attachment 477365
The below is from the RCA main stereo output (Left Channel):
View attachment 477362
And now the same from the "FL" outpout:
View attachment 477359
9dB less distortion!!!
@Rja4000 Since I'm here, this is the J-Test, from RCA outputs, with the vertical scale that goes down to -160dBr, so you can see the noise floor:
View attachment 477364
The two outputs are identical.
EDIT: I could not resist to test
24bits PCM from the USB input.
This is the very standardized SINAD test of
@amirm, that is 1kHz sine @0dBFS (2Vrms output), at 44.1kHz, with FFT length of 32k and 4 averages (3 for Amir, but I can't do only 3):
View attachment 477366
SINAD of 113.3dB (113.8dB for Right Channel).
And the same from FL output:
View attachment 477367
Now we get a
SINAD of 118.3dB! (116.5 for right channel). So that's actually a little better than XLR too
We see two small PS related spikes at 50Hz and 100Hz (around -140dBr).