I am posting this here because the best thing the Xonar Essence sound card has is it's wonderful headphone amp and that is all mine in going to be used for. The Xonar Essence requires a external power source for that headphone amp and with the new power supply I installed it has the unused plug needed. It is astonishing the sound, my AKG 240 Mk II disappear off of my head. I have to lift one of the cans to convince myself the main speakers are not playing. It is playing in 2 channel, PCM 192 KHz, Headphone, in Dolby Pro Logic IIx mode.