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Mackie HM-400 4-Channel Studio Headphone Amplifier — main product image
Mackie

Mackie HM-400 4-Channel Studio Headphone Amplifier

★★★★★4.5 (22 reviews)

Optimize Your Headphone Monitoring with the Mackie HM-400 The Mackie HM-400 4-Channel Headphone Amplifier delivers versatile and high-quality sound for professional audio applications. Perfect for studios, houses of worship, and practice spaces, this rackmount amplifier offers extensive control ...

$199.99*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

Optimize Your Headphone Monitoring with the Mackie HM-400

The Mackie HM-400 4-Channel Headphone Amplifier delivers versatile and high-quality sound for professional audio applications. Perfect for studios, houses of worship, and practice spaces, this rackmount amplifier offers extensive control and connectivity.

Specifications:

  • Channels: 4
  • Headphone Outputs: 12 Total
  • Frequency Response: 20 Hz – 20 kHz, ± 1 dB
  • Input Type: Female XLR balanced; Female 1/4" Balanced ‐ unbalanced
  • Output Type: Male XLR balanced; Female 1/4” balanced ‐ unbalanced
  • Headphone Output Impedance: 3Ω unbalanced
  • Power Requirements: 100 ‐ 120V, 50/60 Hz, 24 W; 220 ‐ 240V, 50/60 Hz, 24 W
  • Dimensions: 1.8 in (H) x 19.0 in (W) x 8.8 in (D)
  • Weight: 8.0 lb

Key Features:

  • L/R Main Stereo Inputs and Outputs
  • Aux Input on Each Channel with Balance Control
  • Mute and Stereo/2-ch Mode Switches Per Channel

Key Features

Demo 4-ch Headphone Amp

Specifications

Brand
Mackie
Model Name
HM-400
Product Type
Headphone Amplifier
Form Factor
Rackmount
Number of Channels
4
Headphone Outputs
12
Mode Switches
4 Stereo/2-channel
Metering
7-segment LED
Inputs
L/R Stereo Inputs
Outputs
L/R Stereo Outputs

Pros & Cons

👍 Pros

  • This rackmount unit offers 4 channels of headphone amplification, accommodating multiple users simultaneously.
  • It provides a total of 12 headphone outputs, allowing for extensive monitoring capabilities in a studio environment.
  • The inclusion of 4 Stereo/2-channel Mode Switches provides versatile routing options for different audio setups.
  • Seven-segment LED metering for each channel offers clear visual feedback on input levels, aiding in monitoring and troubleshooting.
  • Equipped with both L/R Stereo Outputs and L/R Stereo Inputs, it ensures flexible integration with various audio sources and destinations.

👎 Cons

  • The product description does not specify the power output per headphone channel, which might be a concern for high-impedance headphones.
  • Information regarding the frequency response or signal-to-noise ratio of the amplifier is not provided.
  • There is no mention of individual channel volume controls, which is a common feature in headphone amplifiers.
  • Specific details about the build quality or material of the rackmount chassis are not included.
  • The unit's dimensions and weight are not specified, which could impact rack space planning and portability.

Frequently Asked Questions

The Mackie HM-400 provides a total of 12 headphone outputs, distributed across its 4 channels.
Yes, the Mackie HM-400 features 7-segment LED metering, allowing for visual monitoring of input levels.
Yes, the Mackie HM-400 includes 4 Stereo/2-channel Mode Switches for flexible audio routing.
The HM-400 is equipped with both L/R Stereo Inputs and L/R Stereo Outputs for connecting to various audio equipment.
Yes, the Mackie HM-400 is a rackmount headphone amplifier, suitable for integration into studio racks.

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