from $51.99
The HA4000 from On-Stage is a four-channel headphone amplifier, allowing up to four people to personally monitor an audio signal at the same time, all while individually setting their own volume levels. High quality sound is maintained even at full volume. With 20 dB of gain available per channel, the unit is suitable for use in playback or recording scenarios. Routing audio to the unit is accomplished via one 1/4" stereo input jack, and from there, the signal is routed to channels, each one boasting its own volume up and 1/4" headphone output jack.
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 $51.99.
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 On-Stage HA4000 Pro Headphone Amplifier is available at bhphoto, adorama, starting at $51.99.
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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