Model: 500-17200-103
from $3,799
Color: Silver
2 configurations available
The Benchmark HPA4 is a rackmount reference headphone and line amplifier with remote control, presented in a sleek silver finish. This 2U unit offers exceptional audio fidelity, boasting a THD+N of less than -125 dB (0.00006%) and a frequency response extending from 0.1 Hz to 500 kHz (-3 dB). With extensive analog audio I/O including balanced XLR and unbalanced RCA inputs and outputs, a dedicated XLR 4-pin balanced headphone output, and a 1/4" TRS unbalanced headphone output, the HPA4 is designed for critical listening and professional audio applications where precise signal amplification and versatile connectivity are paramount.
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 $3,799.
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 Benchmark HPA4 Rackmount Reference Headphone/Line Amplifier with Remote Control (Silver) is available at bhphoto, starting at $3,799.
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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