• 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.

Specifications:Frequency Response10 Hz – 50 kHz, -±1.0 dB, any input to any output, gain controls set to 50%Voltage Gain34 dB from balanced line to headphone output, 35 dB from headphone input to headphone outputOutput Clipping Level+18 dBu minimum with 600 ohm load, +16 dBu minimum with 300 ohm loadHeadphone Output Impedance200 ohmsInput Clipping LevelXLR: +24 dBu minimum1/4-inch and 1/8-inch inputs: +22 dBu minimumDynamic Range (balanced line inputs)120 dB minimumTHD + Noise0.03% maximum (from 10 Hz to 22 kHz @ +10 dBu input and output level, 300 ohm load, 10 Hz – 22 kHz filter bandwidth)InputsXLR: electronically balanced, 22k ohm input impedance, 1/4-inch unbalanced: 9.1k ohm impedance1/8-inch unbalanced: 9.1k ohm impedance.Internal Voltage Rails±15 V, regulatedPower SourceInternal: 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 LEDGreen indicates power and good battery. Red indicates power with low batteries. LED turns red when ~ 4 hours of battery life remain.Operating Temperature Range0 to 70 degrees C32 to 160 degrees FDimensions43 mm x 94 mm x 140 mm (h x w x d) (1.7″ x 3.7″ x 5.5″)Weight (unit only)0.56 kg1.24 lbsIncluded Accessories1/4-inch to 1/8-inch trs interconnect cable, rubber feet (4), locking DC jackIn the Box: