Mackie HM-400 4-Channel Headphone Amplifier

Mackie HM-400 4-Channel Headphone Amplifier

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Warranty Information

Item	Brand	Type	Condition	Warranty period
Piano	All	Upright, Grand	Reconditioned	2 years
	All	Upright, Grand	New	3 years
	All	Upright, Grand	Renewed	2 years
	Steinway	Grand	Renewed	3 years
	All	Digital	New	1 year
	All	Digital	Used	3 months
Guitar	All	Electric, Bass, Semi-Acoustic	Used	3 months
Guitar	All	Electric, Bass, Semi-Acoustic	New	6 months
Guitar Amplifier	All		New	6 months
Violin	All	Silent, Electric	New	3 months
Viola	All	Silent, Electric	New	3 months
Cello	All	Silent, Electric	New	3 months
Bass	All	Silent, Electric	New	3 months
Drums	All	Electric	New	6 months
Keyboard	Steiner		New	6 months - 1 year
Wind Instrument	All	Wind	New	3 months

For More information on warranty please visit: Warranty Information

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Mackie HM-400 4-Channel Headphone Amplifier

The Mackie HM-400 is a professional-grade 4-channel headphone amplifier designed for studios, broadcast environments, and live setups. Rackmountable in a standard 1U space, the HM-400 offers flexible routing, powerful output, and individualized control for up to 12 headphone connections—making it an essential tool for multi-user monitoring systems.

With individual volume control, EQ, and blend options per channel, the HM-400 ensures customized, high-quality audio monitoring in demanding environments.

Key Features

4 Independent Channels: Each with its own volume, 2-band EQ (Bass & Treble), and aux input control.
12 Total Headphone Outputs: Each channel offers 3 outputs—1 front panel and 2 rear panel jacks.
Aux Input Blending: Balance control lets each user mix their own source with the main stereo input.
Stereo/2-Channel Modes: Selectable per channel for flexible monitoring needs.
Main I/O Options: Balanced XLR and 1/4" TRS inputs and outputs on rear; front-panel stereo input included.
LED Metering: Individual LED level meters per channel and main input.
Built for Professionals: Rugged, all-metal 1U rackmount design for studio or touring use.

Specifications

Specification	Details
Frequency Response	20 Hz – 20 kHz (±1 dB)
Gain	18 dB
Input Impedance	20 kΩ (balanced)
Output Impedance	3 Ω
Total Harmonic Distortion	0.01%
Signal-to-Noise Ratio	-66 dB
Power Consumption	24 W
Dimensions (H x W x D)	1.8" x 19" x 8.8"
Weight	3.6 kg (8 lbs)

Why Choose the Mackie HM-400?

The HM-400 is perfect for professional audio applications where multiple headphone monitoring options are required. With customizable control for each user, robust I/O configurations, and a road-ready design, it’s an ideal solution for studios, live rigs, and podcast production environments alike.