The Mackie HM-400 is a rack-mountable, 4-channel headphone amplifier designed to provide versatile headphone amplification for artists, musicians, and engineers monitoring through headphones in live stage applications and home, project, commercial, and mobile-recording studios. It features a stereo main output via XLR and 1/4" jacks and twelve 1/4" TRS stereo headphone outputs—three per channel—fed by a customizable blend of inputs.
One stereo main input via XLR and 1/4" jacks can be mixed with a per-channel 1/4" stereo aux input. Each channel offers 2-band EQ for quick tone shaping, stereo balance or main/aux input mix control, and output level adjustments. Also on each channel are switches for muting left and/or right signals and operating in stereo or mono. 7-segment LED meters display main input and per-channel output levels.
The HM-400 ships with an IEC power cable and occupies 1 RU in a standard 19" rack.
Here is what you get:
- Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier
- Power Cable
- Limited 1-Year Warranty
Product highlights:
- XLR & 1/4" Stereo Inputs and Outputs
- Three Headphone Outputs per Channel
- Per-Channel 1/4" Stereo Aux Input
- 2-Band EQ, Balance, and Output Controls
- L/R Mute Switches
- Stereo/Mono Mode Switches
- LED Metering
- Includes Power Cable
Mackie HM-400 Specs
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Form Factor
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Rackmount
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Number of Headphone Channels
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4-Channel
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Headphone Output Power
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550 mW per Side into 47 Ohms (Max)
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EQ
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2-Band EQ per Channel
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Display
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5 x Multi-Segment LED Meter
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Connectivity
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Analog Audio I/O
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2 x XLR 3-Pin Balanced Input (1 Stereo Pair)
2 x 1/4" TRS Balanced/Unbalanced Input (1 Stereo Pair)
1 x 1/4" TRS Unbalanced Stereo Input
4 x 1/4" TRS Unbalanced Stereo Aux Input
2 x XLR 3-Pin Balanced Output (1 Stereo Pair)
2 x 1/4" TRS Balanced Output (1 Stereo Pair)
12 x 1/4" TRS Unbalanced Headphone Output
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Performance
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Frequency Response
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20 Hz to 20 kHz ±1 dB
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Gain/Trim Range
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Inputs:
-66 to +18 dBu
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Max Input Level
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Line Inputs:
+15 dBu
Aux Inputs:
+20 dBu
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Max Output Level
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Headphone Outputs:
+21 dBu
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Impedance
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Headphone Outputs:
3 Ohms (Unbalanced)
Inputs:
20 Kilohms (Balanced)
10 Kilohms (Unbalanced)
Aux Inputs:
10 Kilohms (Unbalanced)
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THD
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< 0.01% (at +4 dBu, 1 kHz, Unity Gain)
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Noise
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-66 dB
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CMRR
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Line Inputs:
> 42 dB (1 kHz)
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Power
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Power Requirements
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AC Input
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AC Input Power
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100 to 120 VAC, 50 / 60 Hz
220 to 240 VAC, 50 / 60 Hz
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Power Consumption
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24 W
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Physical
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Rackmount Size
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1 RU
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Dimensions
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19 x 8.8 x 1.8" / 483 x 224 x 46 mm
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Weight
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8.0 lb / 3.6 kg
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Packaging Info
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Package Weight
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10.5 lb
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Box Dimensions (LxWxH)
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20.8 x 10.6 x 4.1"
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