Mackie HM-800 8-Channel Rackmount Headphone Amplifier and Distribution Amp

Mackie HM-800: Eight Independent Headphone Mixes in One Rack Space

The Mackie HM-800 is an eight-channel rackmount headphone amplifier and distribution amp that feeds up to 16 pairs of headphones from a shared source, giving every performer strong, independent volume in a single 1U space. Two discrete stereo main inputs reach all eight channels, while eight per-channel aux inputs let each listener build a personal mix, all metered and controlled from a heavy-gauge steel front panel. For the engineer juggling a full tracking session, it is the moment the headphone chaos finally falls into order.

Power That Keeps Every Pair Loud and Clean

Headphone amplifiers live or die on their ability to drive real-world loads, and the HM-800 delivers 550 milliwatts per side into a 47-ohm load, enough current to push high-impedance studio headphones to strong, distortion-free levels. A frequency response of 20 Hz to 20 kHz within plus or minus 1 dB and total harmonic distortion below 0.005 percent mean the amplifier adds no audible color of its own, so what the talent hears in the cans is the mix as it was sent, not a version smeared by an underpowered output stage.

Two Ways to Feed Every Channel

Each of the eight channels can pull from one of two stereo main inputs or from its own dedicated stereo aux input, selected by a per-channel Input Select switch. That routing is what separates a distribution amp from a simple splitter: the drummer can lock to a click-heavy aux feed while the vocalist rides the main mix, each at their own level. A Stereo/Mono switch on every channel collapses the feed to mono for performers who prefer a centered image or need to hear a single side clearly.

See Every Level at a Glance

Nine seven-segment LED meters line the front panel, one for the main input and one for each channel's output, so the engineer can confirm signal is flowing and spot a hot or dead feed without pulling a single pair of headphones off a player's head. Paired with the individual output-level knobs, the metering turns headphone management into a quick visual scan rather than a round of guesswork during a take.

Built to Expand and Built to Last

Two stereo main outputs on four 1/4-inch jacks pass the incoming mix straight through, so a second HM-800 or an outboard recorder can chain off the first without splitting the signal externally. The whole unit is wrapped in Mackie's heavy-gauge steel Built-Like-A-Tank chassis and occupies just one rack space, making it as at home in a touring rack as it is bolted into a studio's monitor bay.

Who the HM-800 Is For

Recording studios use it to hand every musician an independent cue mix during tracking; houses of worship and rehearsal rooms use it to split one board feed across an entire ensemble; broadcast and podcast rigs use it to keep hosts and guests monitored from a single source. Wherever more than a couple of people need to hear the same source at their own level, the HM-800 turns one output into as many as sixteen clean, controllable feeds.