Description
Asus Xonar Essence STU - USB DAC ( Digital-to-Analog Converter ) + headphone amplifier ; 120dB SNR , asynchronous USB audio . built-in 600ohms headphone amp , outputs : 6.3mm headphone out + RCA ; inputs : AUX + SPDiF ( coaxial + optical ) + USB , 2x dedicated volume control knobs for speaker + headphone , with vertical stand