Sound Devices HX-3
Headphone Distribution Amplifier


Our Price: $409.00
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The compact HX-3 Headphone Distribution Amplifier is the perfect accessory to quickly provide three high-performance stereo headphone feeds with individual level controls from line-level sources. The HX-3 can produce very high headphone levels with extremely low noise and distortion.

Great for radio, television, film, and music production applications, the battery-powered HX-3 accepts balanced XLR line-level inputs or unbalanced 1/4-inch and 1/8-inch stereo inputs. Its 1/4-inch loop-out can connect multiple HX-3's for additional headphone outputs. Headphones are connected to panel-mounted 1/4-inch stereo connectors.

The HX-3 has a durable aluminum chassis to withstand the punishment of field and studio environments. The unit is powered by inexpensive batteries (two-AA) or external 5-18 VDC.

The HX-3 can add headphone outputs to the 442, 302, MixPre, MM-1, and USBPre.


  • Three high-current stereo headphone outputs
  • Individual volume control for each headphone feed
  • Stereoor mono headphone monitoring
  • Peak LED - shows if headphones are clipping
  • Loop output to connect additional HX-3 amps
  • Flexible inputs - balanced line level XLR, stereo 1/4", and stereo 1/8" inputs
  • Battery (2 x AA) or external 5-17 VDC powering
  • Quick change battery compartment
  • Compact, durable mechanical construction


  • Frequency Response: 10 Hz-50 kHz, +/-1.0 dB, any input to any output gain controls set to 50%
  • Voltage Gain:
        * 34 dB - Bal line toheadphones
        * 35 dB - 1/4"& 1/8" to headphones
  • Output Clipping Level:
        * +18 dBu minimum with 600ohm load
        * +16 dB minimum with 300 ohm load
  • Headphone Output Impedance: 200 ohms
  • Input Clipping Level:
        * XLR: +24 dBuminimum
        * 1/4"& 1/8" inputs: +22 dBu minimum
  • Dynamic Range (balanced line inputs): 120 dB minimum
  • THD + Noise: 0.03% maximum (from 10 Hz to 22 kHz @ +10 dBu input and output level)
  • Inputs
        * XLR: electronically balanced, 22 kohm inputimpedance
        * 1/4" unbalanced: 9.1 kohmimpedance
        * 1/8" unbalanced: 9.1 kohm impedance
  • Loop Output: Unbalanced, 200 ohm output impedance
  • Internal Voltage Rails: +15 V and -15 V, regulated
  • Power
        * Internal: 2 AA alkaline batteries, 10 hourslife typical with normal
        * External: 5-17 VDC via threaded coaxial connector
  • Power LED: Green indicated power and good battery, Red indicates powerwith low batteries
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