Mackie HM-400 - 4-Channel Headphone Amplifier

1001629

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Mackie HM-400 is a rack-mountable, 4-channel headphone amplifier designed to provide...
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Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier


 


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


 


 



Specifications



 



Number of Channels



4



Input Connections



2 x XLR 3-pin balanced (one stereo pair)

2 x 1/4" TRS balanced (one stereo pair, also accepts 1/4" TS unbalanced)

1 x 1/4" TRS stereo unbalanced for main input

4 x 1/4" TRS stereo unbalanced for aux inputs



Output Connectors



2 x XLR 3-pin balanced (one stereo pair)

2 x 1/4" TRS balanced (one stereo pair, also accepts 1/4" TS unbalanced)

12 x 1/4" TRS stereo unbalanced headphone outputs



Maximum Input Level



Main Input: +15 dBu

Aux Input: +20 dBu



Maximum Output Level



Headphone Outputs: 550 mW per channel at 47 Ohms (+21 dBu)



Input Impedance



Main Input: 20 kOhms balanced, 10 kOhms unbalanced

Aux Input: 10 kOhms unbalanced



Output Impedance



Headphone Outputs: 3 Ohms unbalanced



Gain Range



Main Input: -66 to +18 dBu



Function Controls



Power on/off

Main level knob

L/R mute switches per channel

Stereo/2-Ch switches per channel

2-band EQ per channel

Balance knob per channel

Output knob per channel



Frequency Response



20 Hz to 20 kHz (±1 dB)



THD



<0.01% (+4 dBu, 1 kHz, unity gain)



Noise



-66 dB



CMRR



Main Input: >42 dB at 1 kHz



Display



1 x input level meter

4 x output level meters



Power Requirement



100 to 120 VAC, 50/60 Hz, 24 W

220 to 240 VAC, 50/60 Hz, 24 W



Power Connector



1 x 3-pin IEC male, 250 VAC, 10 A



Construction Material



Heavy-gauge steel chassis



Dimensions (H x W x D)



1.8 x 19.0 x 8.8" / 46 x 483 x 224 mm



Weight



8 lb / 3.6 kg





 
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