Main Features:
-Built-in tube for pre-amp, making voice sweet and exquisite
-Adopt transistors for class A buffer, so it can easily drive any kind of low resistance earphones with a strong load capacity
- Adopt with high-quality capacitance as the main filter capacitance, making sounds soft and warm, high-frequency and magnificent
- Adopt with 12V DC adapter for power supply, through professional boost circuit, make sure the tube is worked at its best condition
- Built-in overvoltage/overcurrent protection, so that it can be prevented damage to the amplifier if the input voltage/current exceeds the limit value
- Built-in 2-setting gain, suitable for matching with different headphone
- Built-in mute circuit when turning on the amplifier to avoid pop noise and make sure the tube is worked at its best condition
- Use aluminum-shielded case to prevent external interference noise

Parameter:
- Power source: DC 12V adapter
- Supported sampling: USB input. Max 24bit/192KHz
- Output power: 2100mW (32 ohm load)
- Frequency range: 10Hz - 100KHz (+/- 0.5dB)
- Gain: +6/+17dB
- THD+N: 0.03pct (1KHz)
- S/N: 110dB
- Suitable earphone impedance: 16 - 600 ohm
- Compliant OS: for Windows X/Vista/7/8 (must install driver), macOS (do not need to install driver)