Mackie HM-4 4-Way Headphone Amplifier Bundle

The Mackie HM-4 is a straightforward 4-way headphone amplifier built for environments where multiple people need to monitor the same audio source — whether that's a recording studio, a rehearsal space, a house of worship, or a classroom. It takes a single unbalanced 1/4-inch TRS stereo input and distributes it to four headphone outputs, each equipped with its own independent volume knob. This means each listener can dial in their own comfortable level without affecting anyone else in the chain, which is essential when working with a mix of different headphone sensitivities and personal preferences.

Built into a heavy-gauge steel chassis that measures just 4.3 x 2 x 2.3 inches, the HM-4 is remarkably compact and tough enough to handle the rigors of regular use. The included bundle sweetens the deal considerably: a Mophead 10-foot TRS cable gets you connected to your source, four 1/4-inch to 3.5mm adapters ensure compatibility with consumer headphones, and cable ties plus a microfiber cloth round out the package. Powered by the included 12V DC supply, the HM-4 delivers clean, reliable amplification without adding clutter or complexity to your setup.