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Mackie HM-400 Headphone Preamp


The Mackie HM-400 Headphone Amp features four independent input channels and a total of 12 headphone outputs, allowing multiple people to monitor audio with ease and precision. The Mackie HM-400 offers L/R stereo inputs and outputs, along with front panel 1/4'' aux inputs and 7 segment LED metering per channel. The front panel provides mute and stereo/2-ch mode switches, 2-band EQ controls, independent output level controls and balance controls for mixing the main and aux signals. Complete with a 1U rack-mountable chassis, the Mackie HM-400 amp is perfect for installed applications within performance venues, houses of worship, recording studios and practice spaces.


  • 12 total headphone outputs
  • 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
  • Renowed Mackie Built-Like-A-Tank™ construction
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