Model: 500-17200-202
from $3,699
Color: Black
2 configurations available
The Benchmark HPA4 Rackmount Reference Headphone/Line Amplifier is a high-performance audio amplifier designed for critical listening and professional applications. This 2U rackmount unit features an impressive signal-to-noise ratio of over 135 dB for line outputs and 131 dB for headphone outputs, with a remarkably low THD+N of < -125 dB. It offers extensive analog audio I/O, including multiple balanced XLR and unbalanced RCA inputs and outputs, alongside a balanced XLR 4-pin and a 1/4" TRS unbalanced headphone output, delivering up to 6W into 16 Ohms. The HPA4 is ideal for audiophiles and audio professionals seeking precise control and exceptional fidelity for both headphones and line-level audio signals.
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 $3,699.
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 (Black) is available at bhphoto, starting at $3,699.
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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