Xonar Essence ST; World's first Precision Clock Tuning for Revolutionary PC Hi-Fi audio; Industry-leading 24dB SNR; Built-in headphone amp drives every available headphone with <0.001% distortion; Nichicon "Fine Gold" capacitors offer great dynamic performance; Perfectly shielded EMI-free analog output path; Customize your sound color effortlessly via swappable OPAmp socket.