The Mackie HM-4 is one of the easiest ways you'll find to increase the monitoring capacity of your studio. This desktop-friendly headphone amplifier splits a single stereo signal into four headphone outputs, each with its own level control. Premium analog circuitry ensures super-high headroom and a low noise floor, while a heavy-gauge steel chassis and long-wear potentiometers provide extreme durability. The HM-4 is a great way to expand your audio interface's headphone output and add solid cue mix distribution to your rig. The HM-4 delivers high-performance headphone amplification that's sure to become an invaluable asset in your studio.No matter what you're recording, the HM-4 will deliver studio-quality sound. Premium analog circuitry ensures maximum headroom and low noise. We're impressed by just how great this headphone amplifier sounds — especially at this price. The HM-4 can endure a great deal of punishment, thanks to Mackie's Built-Like-A-Tank construction. The HM-4 features a heavy-gauge steel chassis, along with long-wear potentiometers. This is one piece of studio gear that's clearly built to last.