Sound Devices HX-3 Headphone Amplifier

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The compact Sound Devices HX-3 Headphone 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 headphone amplifier 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 552, 302, MixPre-D, MM-1, and USBPre-2.

Sound Devices HX-3 Headphone Amplifier - Features:

• Three isolated headphone outputs with individual volume controls
• 125 dB dynamic range with flat frequency response
• Durable 1/4-inch connectors, panel mounted for strength
• Stereo or mono monitoring
• Peak LED indicates headphone overload
• Two balanced XLR line level inputs or unbalanced 1/4-inch and 1/8-inch stereo inputs
• Loop Output to connect additional HX-3's in series
• All-metal connectors solidly mounted to the chassis for durability and RF immunity
• Free from "Pin-1" grounding problems
• Internal battery-power for up to 18 hours from two AA alkaline batteries
• Chassis-isolated 5 to 18 VDC input for easy external DC powering
• Power LED indicates low battery power
• High strength, extruded aluminum chassis with protective metal end panels

• Frequency Response: 10 Hz - 50 kHz, -±1.0 dB, any input to any output, gain controls set to 50%
• Voltage Gain: 34 dB from balanced line to headphone output, 35 dB from headphone input to headphone output
• Output Clipping Level: +18 dBu minimum with 600 ohm load, +16 dBu minimum with 300 ohm load
• Headphone Output Impedance: 200 ohms
• Input Clipping Level:
  • XLR: +24 dBu minimum
  • 1/4-inch and 1/8-inch inputs: +22 dBu minimum
• Dynamic Range: 120 dB minimum
• THD + Noise: 0.03% maximum (from 10 Hz to 22 kHz @ +10 dBu input and output level, 300 ohm load, 10 Hz - 22 kHz filter bandwidth)
• Inputs:
  • XLR electronically balanced: 22k ohm input impedance
  • 1/4-inch unbalanced: 9.1k ohm impedance
  • 1/8-inch unbalanced: 9.1k ohm impedance
• Internal Voltage Rails: ± 15 V, regulated
• Power Source:
  • Internal: 2 AA alkaline batteries, 18 hours life typical with nominal levels
  • External: 5 - 17 VDC via threaded coaxial connector (5.5 mm outer diameter, 2.1 mm inner diameter), pin positive, sleeve negative
• Power LED: Green indicates power and good battery. Red indicates power with low batteries. LED turns red when ~ 4 hours of battery life remain.
• Included Accessories: 1/4-inch to 1/8-inch trs interconnect cable, rubber feet (4), locking DC jack
• Operating Temperature Range: 32° to 160°F | -0°C to 70°C
• Dimensions (H x W x D): 1.7 x 3.7 x 5.5 in | 43 x 94 x 140 mm
• Weight: 1.24 lbs | .56 kg (unit only)