Model: HA204P
from $127.95
The Rolls HA204p is a portable, battery-operated 4-channel stereo headphone amplifier designed for personal or small group listening. Each of its four 1/8" (3.5mm) TRS stereo outputs features independent volume control, allowing multiple users to monitor audio from a single source. With a frequency response of 15 Hz to 35 kHz and a signal-to-noise ratio of ≥ 90 dB, it delivers clear audio for a variety of headphones (16 to 500 Ohms recommended impedance). Weighing just 0.8 lbs and powered by a 15VDC adapter or approximately 8 hours on battery, this compact unit (4.5 x 4.5 x 1.1") is ideal for on-the-go monitoring, field recording, or small studio applications.
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 $127.95.
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 Rolls HA204p Portable 4-Channel Battery-Operated Headphone Amplifier is available at bhphoto, adorama, starting at $127.95.
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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