Hello. The 560 ohm impedance is the same on analog outputs 1, 2, 3 and 4. But the output levels of outputs 1 and 2 are 6 dB lower than the levels of outputs 3 and 4. Why is this? In what practical case is it useful to have different output levels?
Did you check the output levels on the I/O Settings page? If there is a 6db difference (with 1&2 set the same as 3&4) then it may be because 1&2 are more likely to be sent to mic level inputs than 3&4 are. Fortunately, it’s all adjustable.
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Output levels can be changed, but hardware levels are fixed and cannot be changed.
It has nothing to do with the balanced TRS connection since the XLR outputs are also balanced.
But the XLR outputs are always balanced. The TRS outputs support balanced and unbalanced connections. So they probably had to decide between keeping the balanced output at 9.5dB and unbalanced 3.5dB or this.
It has to do with the TRS connections on the other side, what the QC is connecting to. Only if that side also has balanced jacks will you get the boost/doubled signal.