HM Series Headphone Amplifiers
Expand
Your Versatility
Perfect for studios, practice spaces, quiet stages, and more, the HM Series offers everything you need whether it is just splitting a single signal to your band, or more complex headphone distribution.
Flexible
Headphone amplification
Whether you need to expand your home studio headphone monitoring capability or add robust cue mix distribution, the affordable HM Series offers the sound quality, reliability, and flexibility you need to expand your setup.
The ultra-compact HM-4 offers a simple yet effective way to split a single stereo signal out into four pairs of headphones. Perfect for quickly splitting a phones mix in the studio or even crowding around a tablet to watch a movie at home.
The two 19″ rackmount models, the HM-400 and HM-800, deliver flexible, robust headphone distribution for studios, practice spaces and more.
Features
Great-sounding, reliable headphone amplification
superior
Excellent Sound Quality
Premium analog circuitry and design delivers an ultra-low noise floor and high headroom.
Choice
Ultra-Flexible
From a simple yet effective way to split a single stereo signal out to four pairs of headphones to robust headphone distribution, the HM Series offers a wide range of options to suit your needs.
rugged
Built-Like-A-Tank™
With a heavy-gauge steel chassis, long wear potentiometers and switches
Mackie HM-400 Overview
The Mackie HM-400 is a rack-mountable, 4-channel headphone amplifier designed to provide versatile headphone amplification for artists, musicians, and engineers monitoring through headphones in live stage applications and home, project, commercial, and mobile-recording studios. It features a stereo main output via XLR and 1/4″ jacks and twelve 1/4″ TRS stereo headphone outputs—three per channel—fed by a customizable blend of inputs.
One stereo main input via XLR and 1/4″ jacks can be mixed with a per-channel 1/4″ stereo aux input. Each channel offers 2-band EQ for quick tone shaping, stereo balance or main/aux input mix control, and output level adjustments. Also on each channel are switches for muting left and/or right signals and operating in stereo or mono. 7-segment LED meters display main input and per-channel output levels.
The HM-400 ships with an IEC power cable and occupies 1 RU in a standard 19″ rack.
Mackie HM-400 Specs
Number of Channels | 4 |
Input Connections | 2 x XLR 3-pin balanced (one stereo pair) 2 x 1/4″ TRS balanced (one stereo pair, also accepts 1/4″ TS unbalanced) 1 x 1/4″ TRS stereo unbalanced for main input 4 x 1/4″ TRS stereo unbalanced for aux inputs |
Output Connectors | 2 x XLR 3-pin balanced (one stereo pair) 2 x 1/4″ TRS balanced (one stereo pair, also accepts 1/4″ TS unbalanced) 12 x 1/4″ TRS stereo unbalanced headphone outputs |
Maximum Input Level | Main Input: +15 dBu Aux Input: +20 dBu |
Maximum Output Level | Headphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu) |
Input Impedance | Main Input: 20 kOhms balanced, 10 kOhms unbalanced Aux Input: 10 kOhms unbalanced |
Output Impedance | Headphone Outputs: 3 Ohms unbalanced |
Gain Range | Main Input: -66 to +18 dBu |
Function Controls | Power on/off Main level knob L/R mute switches per channel Stereo/2-Ch switches per channel 2-band EQ per channel Balance knob per channel Output knob per channel |
Frequency Response | 20 Hz to 20 kHz (±1 dB) |
THD | |
Noise | -66 dB |
CMRR | Main Input: >42 dB at 1 kHz |
Display | 1 x input level meter 4 x output level meters |
Power Requirement | 100 to 120 VAC, 50/60 Hz, 24 W 220 to 240 VAC, 50/60 Hz, 24 W |
Power Connector | 1 x 3-pin IEC male, 250 VAC, 10 A |
Construction Material | Heavy-gauge steel chassis |
Dimensions (H x W x D) | 1.8 x 19.0 x 8.8″ / 46 x 483 x 224 mm |
Weight | 8 lb / 3.6 kg |
Package Weight | 10.5 lb |
Box Dimensions (LxWxH) | 20.8 x 10.6 x 4.1″ |