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Expected December 31, 2024
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 19” rackmount HM-400 4-Channel Headphone Amplifier offers an incredible amount of versatility and excellent sound quality in a single rack space. Perfect for professional applications including studios, Houses of Worship, practice spaces, and more. The HM-400 features a main input with level control plus stereo outs, aux inputs and EQ per channel with 12 total headphone outputs.
Whether you need to expand the headphone monitoring capability in your studio, add robust cue mix distribution in the tracking room, or even monitoring on stage, the HM-400 is a perfect, affordable solution for professional, commercial, and home studio applications.
Superior Excellent Sound Quality
Premium analog circuitry and design delivers an ultra-low noise floor and high headroom.
Choice Ultra-Flexible
From a simple yet effective way to split a single stereo signal out to four pairs of headphones to robust headphone distribution, the HM Series offers a wide range of options to suit your needs.
Rugged Built-Like-A-Tank
With a heavy-gauge steel chassis, long wear potentiometers and switches, the HM Series is built to last.
Mackie HM Series HM-400 Flexible 4-Channel Headphone Amplifier 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 Specifications:
Audio Performance:Frequency Responce - 20 Hz-20 kHz, +/-1 dB
Noise - -66 dB
Distortion (THD) - +4 dBu, 1 kHz, unity gain, <0.01%
Maximum Levels:
Main Input - +15 dBu balanced / unbalanced
Aux Input - +20 dBu unbalanced
Headphone Output - 550 mW / channel @ 47 Ω (+21 dBu)
CMRR (Main Input) - >42 dB @ 1 kHz
Gain Range (Main Input) - -66 to 18 dBu
Input / Output:
Input Type - Female XLR Balanced
Main Input Impedance - 20 kΩ balanced, 10 kΩ unbalanced
Aux Input Impedance - 10 kΩ unbalanced
Output Type:
Male XLR Balanced
Female 1/4" Balanced-Unbalanced
Headphone Output Impedance - 3 Ω, unbalanced
Power Requirements:
Detachable line cord:
~100-120V, 50/60 Hz, 24 W
~220-240V, 50/60 Hz, 24 W
Display LEDs:
Front power on/off
Front input level meter
Front output level meters
L/R mute switches
St. / 2-Ch switches
Physical Properties:
Height - 1.8" / 46 mm
Width - 19" / 483 mm
Depth - 8.8" / 224 mm
Weight - 8.0 lb / 3.6 kg
Each HM-400 Retail Box Includes:
(1) Mackie HM Series HM-400 Flexible 4-Channel Headphone Amplifier
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