Sound Devices HX-3 Headphone Amplifier

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.


Product 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.


Product Specifications

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: (balanced line inputs): 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.

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.

Dimensions: 43 mm x 94 mm x 140 mm (h x w x d) (1.7" x 3.7" x 5.5")

Included Accessories: 1/4-inch to 1/8-inch trs interconnect cable, rubber feet (4), locking DC jack

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