SMAKN X5 PCM2706 + CS4344 + Dual-output Headphone Amplifier TDA1308 Parallel USB Amp Program: PCM2706 + CS4344 + double TDA1308 Size: 74 * 70 * 29MM Supply voltage: 5 V (USB powered) Distortion: THD + N: &lt;0.008% (RL = 55 Euro) SNR:&gt; 90 dB