I have the same ones, only 300-ohm ones (yes, there are some), I listen from "Asus xonar d2" through the Pioneer amp - the sound is what it should be. And in short about "Asus xonar d2", if you take the signal from the "Front" connector, then the sound will be better, because. it has a better amplifier, and if the headphones are up to 100 ohms, then you can connect them directly there and nothing else is needed.
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