Model: HBOX-4000
from $44.95
The Pearstone HBOX-4000 is a compact 4-channel stereo headphone amplifier designed to distribute a single audio source to multiple headphones. Each of its four 1/4" TRS headphone outputs features independent volume control, allowing for personalized listening experiences. With a high signal-to-noise ratio of >98 dB and a maximum output level of +22 dB, this amplifier delivers clear and robust audio. Its small footprint (4.1 x 2.3 x 1.3") and lightweight design (8.0 oz) make it suitable for a variety of applications, from home studios to educational settings, where multiple users need to monitor the same audio feed. It operates on 100 to 240 VAC power via an included AC/DC adapter.
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 $44.95.
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 Pearstone HBOX-4000 4-Channel Stereo Headphone Amplifier is available at bhphoto, starting at $44.95.
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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