Mackie HM-4 4-Channel Compact Headphone Amplifier with Level Controls

Mackie HM-4: Four Headphone Feeds From One Simple Box

The Mackie HM-4 is a compact four-channel headphone amplifier that takes a single stereo source and splits it to four headphone outputs, each with its own independent volume control. Wrapped in Mackie's Built-Like-a-Tank steel chassis, it puts personal monitoring for a whole tracking session, rehearsal, or podcast table on a footprint smaller than a paperback. For the engineer tired of daisy-chaining splitters and Y-cables just to get everyone on headphones, the HM-4 is the tidy fix that simply works.

One Source, Four Independent Listeners

Feed the HM-4 a stereo mix through its single 1/4-inch TRS input and it distributes that signal to four 1/4-inch TRS headphone outputs at once. The key is that each output has its own level knob, so the drummer can crank a loud click while the vocalist keeps a gentle blend - nobody has to compromise on a shared volume. It is the difference between four people fighting over one headphone jack and four people each hearing the mix the way they want it.

Clean, Transparent Monitoring

The HM-4 is voiced to stay out of the way, with a full 20 Hz to 20 kHz frequency response held within a tight plus-or-minus 1 dB that passes your mix without adding coloration. A 10k-ohm balanced input and 47-ohm outputs drive typical studio headphones with headroom to spare, so what the listeners hear is an honest reflection of the source - essential when players are making performance decisions off what is in their cans.

Built Like a Tank

Personal monitors live a hard life on desks, floors, and the meter bridges of busy consoles, so Mackie builds the HM-4 into a rugged, heavy-gauge steel chassis engineered to shrug off knocks and years of daily use. All connections are standard 1/4-inch TRS, and the included 12-volt DC power adapter gets it running the moment it is out of the box, while a front-panel power indicator confirms at a glance that the unit is live.

Compact Enough to Go Anywhere

Because it is ultra-compact rather than rackmounted, the HM-4 tucks onto a crowded desktop, rides in a gig bag, or sits at the center of a podcast table without demanding rack space. That portability makes it as at home in a bedroom studio or a classroom as it is in a pro tracking room, giving four people a monitoring feed anywhere you can find a power outlet.

Who the HM-4 Is For

Home-studio owners, band leaders running rehearsal cue feeds, podcasters monitoring with guests, and teachers sharing audio with students reach for the HM-4 whenever up to four people need the same mix. If your sessions have outgrown a single headphone jack but you do not need the EQ and routing of a rackmount system, the HM-4 delivers four clean, individually controlled feeds in the simplest possible package.