Did some further tests.
Very quiet room with only 34dBA of room tone.
Mic is the Rode Reporter approximately 15 cm away from my mouth.
Signal transmitter Sennheiser EW500 G3, sensitivty set to -6dB
On the PCC4k audio in comes from:
Channel 1 (LEFT) = XLR-Mic / 50% gain <- Sennheiser EW100 G3 (AF out = 0dB)
Channel 2 (RIGHT) = 3.5mm-Mic mono / 50% gain <- Sennheiser EW100 G2 (AF out = 0dB)
3.5mm Mic mono on the PCC4k mixes left and right of the 3.5 mm input together, resulting in a hotter signal (because the Sennheiser CL1 mini to mini cable outputs mono to left & right).
Using the spectrum analyzer of iZotope RX 7 Advanced on a selection of "silence" you get this for both channels:
- L-XLR_R-mini-mono_before_Normalizing.png (96.83 KiB) Viewed 27383 times
And after normalizing both channels individually to -1.5 dB you get this:
- L-XLR_R-mini-mono_Normalized_individually.png (109.69 KiB) Viewed 27383 times
So the difference between using the XLR and 3.5 mm input is around 12 to 16dB more noise on the 3.5mm input.
You can download the stereo WAV here (with some more test settings):
https://we.tl/t-mM8G31zIP3 Non active
Sorry for all the pausing between words but English is not my native language and sometimes the brain needs time for processing the information from German to English.
EDIT:
Permanent link to the samples above:
https://laufbildkommission.filemail.com ... zntvudiqad