I have 2 questions:
1-Am I the only one?
2-Is this normal, or did I change something without knowing?
Now, context:
normally when I make a chain, I go from input 1 to output 1/2 95% of the time, but I realized yesterday that if I choose output 3/4, it is much more louder in my headphones monitor.
Context #2: Nothing is actually plugged in any output, so it might only affect the monitoring (?) in which case I could file a bug.
Or is it some sort of hardware limitation between TRS jacks and XLRs ?
I tried it. If you use 1/2 and then switch a chain to 3/4 it sounds louder through the headphones. If you then swipe down to the I/O page tap on the headphone output you will see it will have level controls for outputs 3/4 as well as the headphone out and if you have bumped up the HP level the 3/4 level will be bumped up by the same amount (mine was 6db).
If you reset this dial to zero (just the one for 3/4 on the headphones page) it will work as expected thereafter (i.e. the volumes will be the same for other presets). It’s probably a minor bug of some sort that causes the output to track the HP level on first switch… but once you adjust it on your unit it will be fixed.
Just to clarify – XLR OUT 1/2 are balanced outputs while OUT 3/4 can be balanced or unbalanced, depending on what cable you are using. The spec in the manual shows:
OUT 1/2 XLR: Max Output Level: +9.5dBu
OUT 3/4 TRS: Max Output Level: +15.5dBu balanced, +9.5dBu unbalanced
This is why some people see the XLRs as lower output than the TRS when using balanced cables.