Model: HPA-4X2
from $44.5
The Polsen HPA-4X2 is a compact, 4-channel stereo reference headphone amplifier designed for clear audio monitoring. It features a signal-to-noise ratio of ≥ 98 dB and a total harmonic distortion of < 0.007%, ensuring high-fidelity sound reproduction. With one 1/4" TRS input, one stereo RCA input, and four 1/4" TRS headphone outputs, this amplifier is ideal for distributing a single audio source to multiple listeners in studio, home, or live sound environments.
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 $44.5.
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 Polsen HPA-4X2 4-Channel Stereo Reference Headphone Amplifier is available at bhphoto, starting at $44.5.
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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