The Mackie HM-4 is a 4-way headphone amplifier designed to provide simple and effective headphone amplification for artists, musicians, and engineers monitoring through headphones in home, project, commercial, and mobile-recording studios. Its single 1/4″ TRS stereo input and four 1/4″ TRS stereo outputs allow you to distribute a stereo source to up to four pairs of headphones.

Each output is controlled via a dedicated level knob, allowing varied listening volumes for each person. The compact heavy-gauge steel chassis offers rugged durability and a convenient power status indicator on its front panel. Use the included 12 VDC power supply to power the HM-4.

• Distribute a stereo input signal to up to four pairs of headphones

• Ideal for musicians in home and studio recording sessions

• One unbalanced 1/4″ TRS stereo input

• Four unbalanced 1/4″ TRS stereo headphone outputs

• Dedicated per-output level control allows each person to set a different listening volume

• Front-panel power status indicator

• Heavy-gauge steel chassis for long-lasting durability in the studio or on the road

• Includes 12 VDC power supply