On good headphones, the difference with the standard plug-in is clearly audible. Maybe due to the amp, and a little due to a good elemental base. Happy with the purchase, for its price norms. Got pros: The sound is really good. The card pumps any headphones up to 20 thousand. There are no software problems on win7. I plugged the card into a working HP PC, at work, now there is "noise around", and I'm flying, in the headphones of an audio technician. With its cons: There is only one drawback, and purely aesthetic, the elements on the board are not very evenly soldered.
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