The Zoom ZHA-4 Handy Headphone Amplifier is a compact, 4-channel stereo headphone amplifier designed for personal monitoring and small group listening. It features one 1/8" (3.5mm) TRS unbalanced stereo headphone input and four 1/8" (3.5mm) TRS unbalanced stereo headphone outputs, each with independent volume control and a gain range of 24 dB. Powered by two AA batteries for approximately 3.5 hours (alkaline) or 4.5 hours (NiMH), or via USB-C, this amplifier offers a frequency response of 10 Hz to 50 kHz (±1 dB) and a dynamic range of ≥ 100 dB, making it ideal for musicians, podcasters, or anyone needing to share a single audio source with multiple headphones.
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 $79.99.
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 Zoom ZHA-4 Handy Headphone Amplifier is available at bhphoto, starting at $79.99.
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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