For professionals and enthusiasts alike.
Mackie HM-400 - 4-Channel Headphone Amplifier
Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier
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.
- Distribute signal to up to twelve pairs of headphones
- Occupies 1 RU
- One stereo main input via XLR or 1/4" jacks
- One 1/4" stereo aux input per channel
- One stereo main output via XLR or 1/4" jacks
- Three 1/4" headphone outputs—one on the front panel and two on the rear—per channel fed by an output level control
- 2-band EQ per channel for quick treble and bass adjustments
- Per-channel Balance knob allows control of left/right level balance or aux/main input mix
- Switches on each channel for L/R mute and St/2-Ch (stereo/mono) mode
- 7-segment LED metering for input and each output channel
- Heavy-gauge steel chassis for rugged durability
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Specifications |
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Number of Channels |
4 |
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Input Connections |
2 x XLR 3-pin balanced (one stereo pair) |
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Output Connectors |
2 x XLR 3-pin balanced (one stereo pair) |
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Maximum Input Level |
Main Input: +15 dBu |
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Maximum Output Level |
Headphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu) |
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Input Impedance |
Main Input: 20 kOhms balanced, 10 kOhms unbalanced |
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Output Impedance |
Headphone Outputs: 3 Ohms unbalanced |
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Gain Range |
Main Input: -66 to +18 dBu |
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Function Controls |
Power on/off |
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Frequency Response |
20 Hz to 20 kHz (±1 dB) |
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THD |
<0.01% (+4 dBu, 1 kHz, unity gain) |
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Noise |
-66 dB |
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CMRR |
Main Input: >42 dB at 1 kHz |
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Display |
1 x input level meter |
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Power Requirement |
100 to 120 VAC, 50/60 Hz, 24 W |
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Power Connector |
1 x 3-pin IEC male, 250 VAC, 10 A |
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Construction Material |
Heavy-gauge steel chassis |
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Dimensions (H x W x D) |
1.8 x 19.0 x 8.8" / 46 x 483 x 224 mm |
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Weight |
8 lb / 3.6 kg |
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