Product Description: HA400 Ultra Low Noise 4-Channel Stereo Headphone Amplifier 4 Channels: The HA400 headphone amplifier features four independent stereo high-power amplifier sections. It delivers the highest audio quality even at maximum volume, making it compatible with almost all types of headphones. Enjoy crystal-clear sound without compromise. Share Single Stereo Source: This amplifier allows you to connect up to four headphones to a single stereo source. Each channel has its own individual volume knob, ensuring no crackling or distortion even at top volume. Experience seamless audio sharing with no signal loss when all four headphones are connected. Low Noise: Designed for ultra-low noise operation, the HA400 is perfect for listening to music or watching TV, whether you have multiple settings on your computer or are using a stereo amplifier. Its easy-to-use design ensures a smooth and enjoyable listening experience. Portable: With its durable and compact design, the HA400 is ideal for applications requiring multiple headphone connections. Its strong metal construction ensures tight connections, while the glossy knob operation adds a touch of elegance. This portable amplifier is perfect for on-the-go use. Applications: The HA400 is perfect for up to four people monitoring the mix during workouts, live performances, or simply enjoying TV with earbuds. It is an excellent choice for both studio and stage use, providing reliable performance in any setting. Enhance your audio experience with the HA400 Ultra Low Noise 4-Channel Stereo Headphone Amplifier, designed for superior sound quality and versatility in any environment.