SMSL SH9 Headphone Amplifier

Features 

• *THXAAA-888 Headphone Amplfier with THX AAA Technology
• *6 Watts into 16 Ohm,3 Watts into 32 Ohm Headphones with lowest THD+N
• *0.1Hz to 500kHz(-3dB) Frequency Response
• *SNR>137dB
• *THD<0.00006%
• *Ultra-Compact Design, Perfect for Desktop Systems
• *Balanced Stereo Headphone Output
• *Balanced Stereo Line Input
• *High Precision Resistors for Temperature Stability
• *Pop-less Design with High-Quality Relays
• *High precision and low noise 256 level relay volume control; In actual use, in order to make the volume more linear, the extra levels are shielded.
• *2 Positions Switchable Gain Control
• *Fully Protection with DC, Over-Voltage, Over-Current, Short-Circuit and  Thermal Protection on Headphone Amplifier
• *High-Eficiency Ultra-Low-Noise Power Supply
• *1.9 inch LCD display. 

Specifications 

Audio Section:

• Inputs:Balanced x1, Unbalanced x1
• Outputs:Balanced x1, Unbalanced x1

Output Power:

• 6W x 2(16Ω)
• 3W x 2(32Ω)
• 440mW x 2 (300Ω)
• 220mW x 2 (600Ω)

SNR:137dB, A-Weighted

Output Noise:1.9uV, A-Weighted

 THD+N:-123dB, 0.00006% (A-Weighted)

THD+N:-117dB, 0.00013% (20-20kHz, 32Ω,-3dB)

THD:-125dB, 0.00006%(1kHz, 16Ω, -3dB)

Input Impedance:47kΩ

Output Impedance:Near 0Ω

Frequency Response:0.1Hz-500kHz(-3dB)

Gain:Low(+0dB), High(+10dB) 

General Section:

• Power supply voltage/frequency: AC100-240V, 50-60 Hz
• Power consumption(EN60065):24W
• Power consumption in standby mode:<0.1W
• Size:187.5x154x40(mm)
• Packing size: 282x232x79(mm)
• Weight:790g