Short product description:
The Mackie HM-400 Black is a rackmount headphone amplifier designed for monitoring and distribution in studios and live sound environments. It features a 6.3 mm headphone output, 20 kΩ input impedance, low harmonic distortion (THD 0.01%) and a signal-to-noise ratio of −66 dB. Powered from 100–120 V AC (50–60 Hz), the unit measures 483 × 224 × 46 mm and includes an AC power cable. Suitable for multi-listener monitoring and integration into PA or studio racks.