SMSL SH8s OPA564 Headphone Amplifier

Specifications:
Inputs:  Balanced x1, Unbalanced x1
Outputs:  Balanced x1, 6.35mm x1
Output Power: 6W x 2 (16 Ω),3W x 2 (32 Ω)
SNR: 136dB
Output Noise: 1.3uV
THD+N: -123dB, 0.00006% (1kHz, 32Ω)
THD+N: -120dB, 0.00013% (20-20kHz , 32Ω, -1dB)
THD: <-125dB, 0.00006% 
Input Impedance:  47kΩ
Output Impedance: Near 0 Ω
Frequency Response: 20Hz - 500kHz(-3dB)
Gain: Low(0dB), High(+17.5dB)
Power consumption(EN60065):  <30 W
Power consumption in standby mode: <0.1W
Size: 139.5x41x184.4mm (WxHxD)
Weight: 0.77kg