Mackie HM 400

Mackie HM 400

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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.

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  • Additional information
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Description

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.

 

Additional information

Brands

Mackie

Color

Black

Sub Categories

Headphone Amplifier

  • 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
Number of Channels4
Input Connections2 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 Connectors2 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 LevelMain Input: +15 dBu

Aux Input: +20 dBu

Maximum Output LevelHeadphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu)
Input ImpedanceMain Input: 20 kOhms balanced, 10 kOhms unbalanced

Aux Input: 10 kOhms unbalanced

Output ImpedanceHeadphone Outputs: 3 Ohms unbalanced
Gain RangeMain Input: -66 to +18 dBu
Function ControlsPower 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 Response20 Hz to 20 kHz (±1 dB)
THD<0.01% (+4 dBu, 1 kHz, unity gain)
Noise-66 dB
CMRRMain Input: >42 dB at 1 kHz
Display1 x input level meter

4 x output level meters

Power Requirement100 to 120 VAC, 50/60 Hz, 24 W

220 to 240 VAC, 50/60 Hz, 24 W

Power Connector1 x 3-pin IEC male, 250 VAC, 10 A
Construction MaterialHeavy-gauge steel chassis
Dimensions (H x W x D)1.8 x 19.0 x 8.8" / 46 x 483 x 224 mm
Weight8 lb / 3.6 kg

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