SMSL SH-9, User Manual, Page: 12 / 18

Features
THXAAA-888 Headphone Amplifier with THX AAA Technology ；
6 Watts into 16 Ohm, 3 Watts into 32 Ohm Headphones with lowest THD+N ；
0.1 Hz to 500 kHz(-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-Efficiency Ultra-Low-Noise Power Supply .
1.9 inch LCD display.
Manufactured under license from THX Ltd. THX and the THX logo are
registered in the U.S. and other jurisdictions. All rights reserved.