from $49.99
The Mackie HM-4 is a compact 4-channel stereo headphone amplifier designed for distributing a single stereo signal to up to four headphones. Each of the four 1/4" TRS unbalanced outputs features its own level control, allowing individual listeners to adjust their volume. With a single 1/4" TRS unbalanced stereo input, this lightweight unit (0.5 lb) is powered by an included 12 VDC AC/DC adapter, making it ideal for small studios, practice spaces, or personal monitoring setups where multiple users need to hear the same audio source.
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 $49.99.
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 Mackie HM-4 4-Way Headphones Amplifier is available at bhphoto, starting at $49.99.
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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