1084S schematics shows resistor (potentiometer labeled "balance") connected between R and L lines that will mix channels. No idea how much but some.
Unless you plug your headphones directly to Amiga outputs (which won't work, you need some amplification and I am quite sure any headphone adapter will do some mixing), there is no guarantee what happens.
EDIT: It is same thing as video output. Amiga is internally fully digital so "real" output would be 100% pixel perfect which is not what you actually see on real hardware, it depends on output device, connection and if you have internal or external flicker fixer and so on. It is user's choice.
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