Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

B&H # MAHM400 MFR # HM-400
Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

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Product Highlights

  • 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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Mackie HM-400 overview

  • 1Description

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
UPC: 663961054071
In the Box
Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier
  • Power Cable
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    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 <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
    Packaging Info
    Package Weight 10.5 lb
    Box Dimensions (LxWxH) 20.8 x 10.6 x 4.1"

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