Mackie HM-400 – 4-Channel Rackmount Headphone Amplifier for Studio & Live Monitoring
The Mackie HM-400 is a professional 4-channel headphone amplifier designed for studios, rehearsal rooms and live monitoring setups requiring clear, powerful and flexible headphone distribution. With robust build quality, per-channel controls and multiple output options, it ensures every performer hears exactly what they need during tracking or performance.
Key Features
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4 independent headphone channels: Each channel includes three headphone outputs, giving you a total of twelve outputs for multi-user monitoring.
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Flexible input mixing: A main stereo input can be combined with per-channel 1/4″ aux inputs to create customized mixes for each performer.
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2-band EQ per channel: Shape tone quickly and adapt to different headphones or listening preferences.
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Stereo/mono & mute switches: Adjust channel behavior with dedicated controls for left/right mute, stereo/mono and main/aux blend.
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Clear metering: 7-segment LED meters provide at-a-glance feedback for both the main input and each channel’s output level.
Customer Benefits
The HM-400 gives studios and stage setups dependable and highly customizable monitoring. Performers can dial in the exact mix and tone they need, while engineers can distribute a clean, consistent signal to multiple listeners without complexity. Its rugged rackmount chassis ensures long-term reliability for professional use.
Quick Specs
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Main inputs: Stereo XLR + 1/4″
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Aux inputs: 4 × per-channel 1/4″ stereo aux
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Headphone outputs: 12 × 1/4″ stereo (three per channel)
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Controls per channel: Output level, 2-band EQ, stereo/mono, left/right mute, balance or main/aux mix
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Metering: 7-segment LED meters for main input and each channel
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Form factor: 1U rackmount
What’s in the Box
- Mackie HM-400 headphone amplifier
- Power cable
- Documentation
Use Cases / Ideal For
Recording studios, podcast teams, rehearsal spaces, small performance venues, broadcast environments and multi-musician tracking sessions.
Compatibility
Works with standard headphones, audio interfaces, mixers and signal distribution systems using XLR or 1/4″ connections.
Pros & Cons
✅ Pros:
- Three headphone outputs per channel for flexible multi-user setups
- Per-channel EQ and mix control
- Robust rackmount design
- Clear metering for accurate level monitoring
⚠️ Cons:
- No 3.5 mm headphone outputs—adapters may be required
- Requires rack space in fixed installations
The Mackie HM-400 provides powerful, adaptable and reliable headphone monitoring, making it a trusted choice for professional studios and live environments — available at Soundium.
