Mackie HM-400 4-Channel Headphone Amplifier

The 19” rackmount Mackie HM-400 4-Channel Headphone Amplifier offers an incredible amount of versatility and excellent sound quality in a single rack space. The HM-400 features a main L/R stereo input that feeds into four channels with separate EQ and Aux In plus three outputs each for a total of 12 headphone outputs. This rugged amplifier is perfect for professional applications such as studios, houses of worship, and practice spaces. For routing versatility and a high number of outputs, consider the Mackie HM-400 today.

Features

• L/R Main stereo inputs plus L/R stereo outputs
• 7 segment LED metering per channel plus main
• 3 headphone outputs per channel
• Aux input on each channel with balance control to mix main and aux signal
• Mute and stereo/2-ch mode switches per channel
• 12 total headphone outputs
• Built-Like-A-Tank™ construction

Specifications

• Audio Performance:
  • Frequency Response: 20 Hz - 20 kHz, ±1 dB
  • Noise: -66 dB
  • Distortion (THD) (+4 dBu, 1 kHz, unity gain): < 0.01%
  • Maximum Levels:
    • Main Input: +15 dBu balanced/unbalanced
    • Aux Input: +20 dBu unbalanced
    • Headphone Output: 550 mW / channel @ 47 Ω (+21 dBu)
  • CMRR (main input): > 42 dB @ 1 kHz
  • Gain Range (main input): -66 to 18 dBu
• Input/Output:
  • Input Type: Female XLR balanced, female 1/4" balanced/unbalanced
  • Main Input Impedance: 20 kΩ balanced, 10 kΩ unbalanced
  • Aux Input Impedance: 10 kΩ unbalanced
  • Output Type: Male XLR balanced, female 1/4" balanced/unbalanced
  • Headphone Output Impedance: 3 Ω unbalanced
• Power Requirements:
  • Detachable Line Cord:
    • -100 - 120V, 50/60 Hz, 24 W
    • -220 - 240V, 50/60 Hz, 24 W
  • AC Connector: 3-pin IEC 250 VAC, 10 A male
• Display LEDs:
  • Front: Power on/off, input level meter, output level meters
  • L/R mute switches
  • St. / 2-Ch switches
• Dimensions (H x W x D): 1.8" x 19.0" x 8.8"
• Weight: 8.0 lbs.