The On-Stage HA4000 Pro Headphone Amplifier 1in-4out is a versatile and robust solution for audio professionals who require efficient headphone distribution. Designed for high-quality audio routing, this headphone amplifier allows you to connect a single audio source and distribute it across four independent headphone outputs. Whether you're in a recording studio, broadcasting, or live sound environment, the HA4000 delivers clear, distortion-free sound to multiple users simultaneously. Its compact design makes it easy to integrate into any setup, providing reliable performance and flexibility. With independent volume controls for each output, users can customize their listening levels without affecting others. This makes it an ideal tool for collaborative work environments where multiple users need to monitor the same audio feed.