Mackie HM-400 4-Channel Headphone Amplifier

Mackie HM-400

Mackie HM-400 4-channel headphone amplifier provides 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.

Mackie HM-400 Features

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

Mackie HM-400 Spec

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

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

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