Mackie HM-400 4-Channel Rackmount Headphone Amplifier

Versatile 4-Channel Headphone Distribution For Professional Applications

The Mackie HM-400 19" 4-Channel Headphone Amplifier delivers exceptional flexibility, clarity, and control in a rugged 1U rackmount format. Designed for professional environments such as recording studios, rehearsal spaces, and Houses of Worship, the HM-400 makes it easy to distribute high-quality audio to multiple listeners simultaneously — ensuring every performer, engineer, or listener hears exactly what they need.

Each of the four channels features its own level, EQ, and aux input control, allowing users to create personalised headphone mixes. With a total of 12 headphone outputs (three per channel), the HM-400 can accommodate multiple performers or monitoring stations from a single rack-mounted unit, maintaining pristine audio quality across all outputs.

Practical Performance and Simple Operation

The Mackie HM-4 is engineered for convenience and precision. Each of the four headphone outputs includes its own dedicated volume control, allowing every user to adjust their listening level independently. Whether you’re tracking vocals, rehearsing as a band, or reviewing mixes, the HM-4 ensures consistent performance across all channels. Its compact size makes it easy to integrate into any studio setup or stage environment.

Customised Monitoring And Studio Integration

Every channel on the HM-400 includes an aux input with balance control, allowing users to mix a secondary signal (such as a click track or cue feed) alongside the main stereo input for tailored headphone mixes. 7-segment LED metering provides accurate visual monitoring of levels, while mute and stereo/2-channel mode switches give added flexibility for various monitoring configurations.

Its main stereo inputs and outputs make the HM-400 easy to integrate into any studio or live setup, while the Built-Like-A-Tank™ construction ensures durability for years of dependable performance. Whether used for recording sessions, rehearsals, or broadcast monitoring, the HM-400 delivers professional-grade sound distribution in a single rack space.

KEY FEATURES: Mackie HM-400 4-Channel Rackmount Headphone Amplifier

• Channel Configuration: 4 independent headphone channels, each with level, EQ, and aux input
• Outputs: 3 headphone outputs per channel (12 total)
• Inputs: L/R main stereo inputs and outputs, individual channel aux inputs
• Metering: 7-segment LED meters per channel and main
• Controls: Mute and stereo/2-channel mode switches per channel
• Construction: Heavy-duty metal chassis for professional reliability
• Form Factor: 19" rackmount, 1U height
  

Download the PDF user manual here