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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.
- XLR & 1/4" Stereo Inputs and Outputs
- Three Headphone Outputs per Channel
- Per-Channel 1/4" Stereo Aux Input
- 2-Band EQ, Balance, and Output Controls
- L/R Mute Switches
- Stereo/Mono Mode Switches
- LED Metering
- Includes Power Cable
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Technical Specification
- Type: Headphone Amplifier
- 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: <0.01% (+4 dBu, 1 kHz, unity gain)
- 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
- Warranty: 1 year
What Is In The Box
- Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier
- Power Cable
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Manufacture Description
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.
HM-400
4-CHANNEL HEADPHONE AMPLIFIER
- L/R Main stereo inputs plus L/R stereo outputs
- 7-segment LED metering per channel plus Main
- 3 headphone outputs per channel
- Aux input on each channel with balance control to mix main and aux signal
- Mute and stereo/2-ch mode switches per channel
- 12 total headphone outputs
- Built-Like-A-Tank™ construction
- 16 total headphone outputs
- Built-Like-A-Tank™ construction