Overview : The Mackie HM-4 is one of the easiest ways you #39;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 #39;s headphone output and add solid cue mix distribution to your rig. The HM-4 delivers high-performance headphone amplification that #39;s sure to become an invaluable asset in your studio. No matter what you #39;re recording, the HM-4 will deliver studio-quality sound. Premium analog circuitry ensures maximum headroom and low noise. You will impress by just how great this headphone amplifier sounds especially at this price. Features : - Desktop-friendly 4-channel headphone amplifier - Splits a single stereo signal into four headphone outputs - Expands your audio interface #39;s headphone output and adds solid cue mix distribution to your rig - Each output features its own level control - Premium analog circuitry ensures super-high headroom and a low noise floor - Heavy-gauge steel chassis and long-wear potentiometers provide extreme durability - Power supply is included