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If I plug in two headphones with different impedance, how volume adjustment works? Do the two headphones get same volume?
No. The volume knob on any amp is actually a voltage potentiometer.
If you have it turned to 1/2 on a pair of 250 Ohm headphones and it is a reasonable volume, then switch to a pair of 35 Ohm headphones and do not adjust the volume you will likely blow out the lower Ohm headphones. RIP if you have them on your head already.