Model: HX-3
from $655
The Sound Devices HX-3 is a compact, portable 3-channel headphone amplifier designed for professional audio monitoring. Weighing just 1.2 lbs and powered by two AA batteries, it offers exceptional portability without compromising audio quality, boasting a THD+N of 0.03% (Max, 10 Hz to 22 kHz, 300-Ohm Load) and a frequency response of 10 Hz to 50 kHz ±1 dB. With a versatile array of analog audio I/O, including XLR, 1/4" TRS, and 1/8" TRS inputs and outputs, the HX-3 is ideal for on-location sound engineers, musicians, and broadcast professionals needing reliable, high-fidelity headphone monitoring for multiple users.
Match your amplifier's power output (Watts RMS) to your speakers' sensitivity and impedance (Ohms). Do not obsess over astronomical peak wattage claims; RMS is the true measure of sustained power. Available from $655.
Amplifiers have practically zero ongoing costs aside from electricity, which is highly variable based on usage volume and class type (Class A uses more power than Class D). Good amplifiers can last decades with proper care. Consumables are virtually non-existent unless using tube amps.
Common Failure Modes
Solid-state amplifiers are extremely reliable. Failures usually stem from blown capacitors, overheated output transistors, or physical wear on volume potentiometers. Proper ventilation prevents 90% of heat-related failures.
Match your amplifier's power output (Watts RMS) to your speakers' sensitivity and impedance (Ohms). Do not obsess over astronomical peak wattage claims; RMS is the true measure of sustained power. Class D amplifiers run cool and are compact, while Class A/B offer traditional warm sound at the expense of heat and size.
Solid-state amplifiers can last 20+ years. Capacitors may eventually dry out and need replacement.
The Sound Devices HX-3-3 Channel Portable Headphone Amplifier is available at bhphoto, starting at $655.
Amplifiers have practically zero ongoing costs aside from electricity, which is highly variable based on usage volume and class type (Class A uses more power than Class D). Good amplifiers can last decades with proper care. Consumables are virtually non-existent unless using tube amps.
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