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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.
Distribute signal to up to twelve pairs of headphones
Occupies 1 RU
One stereo main input via XLR or 1/4" jacks
One 1/4" stereo aux input per channel
One stereo main output via XLR or 1/4" jacks
Three 1/4" headphone outputs—one on the front panel and two on the rear—per channel fed by an output level control
2-band EQ per channel for quick treble and bass adjustments
Per-channel Balance knob allows control of left/right level balance or aux/main input mix
Switches on each channel for L/R mute and St/2-Ch (stereo/mono) mode
7-segment LED metering for input and each output channel
Heavy-gauge steel chassis for rugged durability
Mackie HM-400 Specs
Form Factor Rackmount
Number of Headphone Channels 4-Channel
Headphone Output Power 550 mW per Side into 47 Ohms (Max)
EQ 2-Band EQ per Channel
Display 5 x Multi-Segment LED Meter
Connectivity
Analog Audio I/O 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
Performance
Frequency Response 20 Hz to 20 kHz ±1 dB
Gain/Trim Range Inputs:
-66 to +18 dBu
Maximum Input Level Line Inputs:
+15 dBu
Aux Inputs:
+20 dBu
Maximum Output Level Headphone Outputs:
+21 dBu
Impedance Headphone Outputs:
3 Ohms (Unbalanced)
Inputs:
20 Kilohms (Balanced)
10 Kilohms (Unbalanced)
Aux Inputs:
10 Kilohms (Unbalanced)
THD < 0.01% (at +4 dBu, 1 kHz, Unity Gain)
Noise -66 dB
CMRR Line Inputs:
> 42 dB (1 kHz)
Power
Power Requirements AC Input
AC Input Power 100 to 120 VAC, 50 / 60 Hz
220 to 240 VAC, 50 / 60 Hz
Power Consumption 24 W
Physical
Rackmount Size 1 RU
Dimensions 19 x 8.8 x 1.8" / 483 x 224 x 46 mm
Weight 8.0 lb / 3.6 kg
