Made for Everyday｜Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier｜ Electronic Accessories

Key Features

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

Overview

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.
Key Specs

Number of Headphone Channels

4-Channel

Headphone Output Power

550 mW per Side into 47 Ohms (Max)

Analog Audio I/O

2x XLR 3-Pin Balanced Input (1 Stereo Pair)2x 1/4" TRS Balanced/Unbalanced Input (1 Stereo Pair)1x 1/4" TRS Unbalanced Stereo Input4x 1/4" TRS Unbalanced Stereo Aux Input2x XLR 3-Pin Balanced Output (1 Stereo Pair)2x 1/4" TRS Balanced Output (1 Stereo Pair)12x 1/4" TRS Unbalanced Headphone Output
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Power Requirements

AC Input

Number of Headphone Channels

4-Channel

Headphone Output Power

550 mW per Side into 47 Ohms (Max)

EQ

2-Band EQ per Channel

Display

5x Multi-Segment LED Meter

Connectivity

Analog Audio I/O

2x XLR 3-Pin Balanced Input (1 Stereo Pair)2x 1/4" TRS Balanced/Unbalanced Input (1 Stereo Pair)1x 1/4" TRS Unbalanced Stereo Input4x 1/4" TRS Unbalanced Stereo Aux Input2x XLR 3-Pin Balanced Output (1 Stereo Pair)2x 1/4" TRS Balanced Output (1 Stereo Pair)12x 1/4" TRS Unbalanced Headphone Output

Performance

Frequency Response

20 Hz to 20 kHz ±1 dB

Gain/Trim Range

Inputs:-66 to +18 dBu

Maximum Input Level

Line Inputs:+15 dBuAux Inputs:+20 dBu

Maximum Output Level

Headphone Outputs:+21 dBu

Impedance

Inputs:20 Kilohms (Balanced)10 Kilohms (Unbalanced)Aux Inputs:10 Kilohms (Unbalanced)Headphone Outputs:3 Ohms (Unbalanced)

THD

< 0.01% (at +4 dBu, 1 kHz, Unity Gain)

Noise

-66 dB

CMRR

Line Inputs:> 42 dB (1 kHz)

Power

Power Requirements

AC Input

AC Input Power

100 to 120 VAC, 50 / 60 Hz220 to 240 VAC, 50 / 60 Hz

Power Consumption

24 W

Physical

Rackmount Size

1 RU

Dimensions

19 x 8.8 x 1.8" / 483 x 224 x 46 mm

Weight

8.0 lb / 3.6 kg

Packaging Info

Package Weight

9.75 lb

Box Dimensions (LxWxH)

20.8 x 10.6 x 4.1"

What's in the Box:

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

Limited 1-Year Manufacturer Warranty
Brand:MackieSKU:HM-400Tags:audio interface, Headphone Amplifier, HM-400, mackie, Mackie HM-400, mackie hm400