Aune X1S 32Bit/384KHz DSD DAC Headphone Amplifier Black 5th generation of the aune X1 series Coaxial Optical Decoding: highest 24BIT / 192K Distortion THD + N @ 1KHz: -110dB IMD + N @ 19KHz & 20KHz: -110dB USB Decoding: highest 32BIT / 384K.DSD128