Model: CM-HPR1
from $458
The Sonifex CM-HPR1 is a passive headphone volume control designed for professional audio environments. This compact unit features a single RJ45 8-pin input for audio, delivering a frequency response of 20 Hz to 20 kHz with exceptionally low distortion (< 0.01% THD) and noise (< -115 dBu). Ideal for individual monitoring, it requires no external power and provides precise volume adjustment for headphones with a recommended impedance of 150 Ohms.
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 $458.
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 Sonifex CM-HPR1 Passive Headphone Volume Control with StudioHub+ RJ45 Input is available at bhphoto, starting at $458.
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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