Maybe 3dB of excess gain, for some situations. So perhaps room for a low level of NFB too, if desired
I am not actually convinced that this is correct. You should have the following input connector pinout:Thanks for the tips.
I revisited the cables and they have been made correctly - twin shielded and screened audio cable with one wire from to signal - signal, one from gnd - gnd and shield connected to gnd only on the interface side.
You may have had the output turned down digitally (maybe the software volumee control exposed in the OS is driver-level attenuation only). Turn down the 2i4's MONITOR control to reach previous levels. Turning up volume in Windows should bring non-ASIO levels up.Switching to ASIO makes the DUT clip so I need to look into this more.
1 Vrms (XLR no pad) and 2 Vrms (XLR w/ pad) would be pretty standard, I suppose.I've had a look at the absolute level calibration and have a Fluke179 that is capable. I'll have a play with this to get consistency.
What voltages do you suggest for the testing?