Mackie HM-400 Headphone Amplifier

The 19" Rackmount hm-400 4-channel headphone amplifier offers an incredible amount of versatility and excellent sound quality in a single rack space, making it perfect for professional applications such as studios, houses of worship, practice spaces, and more. Featuring a main input with level control, stereo outs, aux inputs, and EQ per channel, the hm-400 boasts 12 total headphone outputs.

Key features of the hm-400 include: - L/R main stereo inputs and L/R stereo outputs - Segment LED metering per channel, plus main three 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

In terms of audio performance, the hm-400 delivers: - Frequency response: 20 Hz - 20 kHz, ± 1 dB - Noise: -66 dB - Distortion (THD): +4 dBu, 1 kHz, unity gain; 42 dB @1 kHz - Gain range (main input): -66 to 18 dBu

The input and output specifications are as follows: - 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: 3ω unbalanced

Regarding power requirements, the hm-400 can operate on 100 - 120V or 220 - 240V, 50/60 Hz, and consumes 24 W. It features a detachable line cord and a 3-pin IEC 250 VAC, 10 A male AC connector.

The physical properties of the hm-400 include a height of 1.8 in/ 46 mm, a width of 19.0 in/ 483 mm, a depth of 8.8 in/ 224 mm, and a weight of 8.0 lb/ 3.6 kg. It is designed for rackmount installation.

Overall, the hm-400 4-channel headphone amplifier is a versatile and high-quality solution for professional audio applications, offering a comprehensive set of features and exceptional sound performance in a compact, rack-mountable package.

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