Portable, Battery-Powered Headphone Distribution Amplifier

User Guide | Fact Sheet | Panel Description | Accessories
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.
Technical Details |
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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. |
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. |
Operating Temperature Range |
0 to 70 degrees C |
32 to 160 degrees F |
Dimensions |
43 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 kg |
1.24 lbs |
Included Accessories |
1/4-inch to 1/8-inch trs interconnect cable, rubber feet (4), locking DC jack |