User manual
Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

User Manual for Mackie HM-400 Rack-Mountable, 4-Channel Headphone Amplifier

• Product category: Headphone Amplifiers Mackie
• Brand: Mackie
• Description and content of package
• Technical information and basic settings
• Frequently asked questions – FAQ
• Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
• Authorized service for Mackie Headphone Amplifiers

Product description

• 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

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Technical parameters

Mackie HM-400 Specs

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 ( Rating 60% users recommend this product to others. And what about you? This product has already been rated by 79 owners. Add your rating and experience with the product. Discussion Ask our technicians if you have a problem with your settings, or if anything is unclear in the user manual you have downloaded. You can make use of our moderated discussion. The discussion is public and helps other users of our website who may be encountering similar problems. The discussion is empty - enter the first post Post a new topic / query / comment: Items marked with * are required. Your name *: E-mail : Subject *: Message *: Your email address will not be displayed. Do not forget to fill it in if you want to receive a reply to your enquiry/contribution. Processing of personal data in accordance with GDPR