
Mackie HM-400 4-Channel Headphone Amplifier Rackmount
Maximize Your Monitoring Capabilities with the Mackie HM-400 Headphone Amplifier The Mackie HM-400 is a versatile 4-channel headphone amplifier, designed for professional audio environments. With 12 headphone outputs, individual channel controls, and flexible input options, the HM-400 delivers ex...
*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Maximize Your Monitoring Capabilities with the Mackie HM-400 Headphone Amplifier
The Mackie HM-400 is a versatile 4-channel headphone amplifier, designed for professional audio environments. With 12 headphone outputs, individual channel controls, and flexible input options, the HM-400 delivers exceptional sound quality and control. Perfect for studios, houses of worship, and practice spaces.
Specifications:
- Channels: 4
- Headphone Outputs: 12 (3 per channel)
- Inputs: L/R Main Stereo Inputs, Aux Input per channel
- Outputs: L/R Main Stereo Outputs
- Controls: Level Control, Balance Control, Mute Switch, Stereo/2-ch Mode Switch per channel
- Mounting: 19” Rackmount
Key Features
L/R main stereo inputs plus L/R stereo outputs
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
Specifications
Pros & Cons
👍 Pros
- Features a comprehensive set of L/R main stereo inputs and outputs, allowing for flexible signal routing within a professional setup.
- Equipped with three headphone outputs per channel, providing ample monitoring points for multiple musicians or engineers.
- Includes an Aux input on each channel with a balance control, enabling precise mixing of main and auxiliary signals for individual monitoring.
- Offers Mute and Stereo/2-ch Mode switches per channel, which provides greater control over individual headphone mixes.
- Boasts a total of 12 headphone outputs, making it highly suitable for large ensemble recording sessions or live monitoring scenarios.
👎 Cons
- The features do not specify the power output per headphone channel, which might be a concern for driving high-impedance headphones.
- Without explicit details on the signal-to-noise ratio or distortion, assessing its sonic transparency beyond basic functionality is difficult.
- The rackmount form factor means it is not designed for portable, on-the-go setups, requiring a dedicated rack space.
- While it has many outputs, the lack of individual channel EQ controls means tonal adjustments must happen upstream.
- Input impedance details are not provided, which could be a factor when connecting various line-level sources for optimal gain staging.