from $75.99
The LD Systems HPA 4 Headphone Amplifier is a compact, 4-channel amplifier designed for personal monitoring and studio applications. It features one stereo RCA unbalanced input and one 1/4" TRS link input, distributing audio to four individual 1/4" TRS headphone outputs, each capable of delivering 100 mW of power. With a frequency response of 20 Hz to 20 kHz and a recommended headphone impedance of 10 Ohms (minimum), this amplifier is ideal for musicians, podcasters, or anyone needing to distribute a single audio source to multiple headphones with clear, consistent sound. Its small footprint (3.7 x 3.2 x 1.9") and light weight (0.6 lb) make it a convenient addition to any setup.
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 $75.99.
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 LD Systems HPA 4 Headphone Amplifier is available at bhphoto, starting at $75.99.
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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