The QuPac stereo line inputs are said to “normal” connections (ie parallel the L & R signals if only the L jack is inserted).
Is this also the case for stereo outputs (eg Alt Out)
AlanG
Based on the documentation I say no.
The Qu24/32 system block diagram clearly shows R being connected to L until a plug is inserted in R.
No outputs on the diagram show anything but separate L and R plug connections directly to just L and R respectively.
I recall seeing what you said about input and the diagram confirms it, but searching for that as text I did not find it anywhere.
So it is possible that somewhere there is text that contradicts the diagram for stereo outs. However, I seriously doubt that the QuPac is different.
Found the QuPac diagram https://www.allen-heath.com/media/Qu-Pac-block-diagram_V1.8_1.pdf
It is essentially the same as the Qu 24/32 was.
If you want one mono out can’t you just use a Y connector ? Amazon has them at about 4/$20.
The stereo line inputs are physically normalled but the stereo outs are not.
If mono output is desired then the I/O patch screen will allow L+R to be set in software.