Model: CM-HPX1
from $458
The Sonifex CM-HPX1 is a passive headphone volume control designed for professional audio environments. This compact unit features two XLR 3-pin balanced inputs for a stereo pair and a 1/4" TRS stereo output, allowing for precise level adjustment of a single headphone channel without requiring external power. With a wide frequency response of 20 Hz to 20 kHz, a low THD of < 0.01%, and excellent CMRR of > 80 dB, the CM-HPX1 ensures high-fidelity audio reproduction, making it ideal for monitoring applications where reliable and accurate headphone control is essential.
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-HPX1 Passive Headphone Volume Control with XLR Inputs 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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