from $199.99
The Mackie HM-400 is a rack-mountable, 4-channel headphone amplifier designed for professional audio environments. Each of the four channels features a 2-band EQ and a dedicated 5-segment LED meter for precise monitoring. With a frequency response of 20 Hz to 20 kHz (±1 dB) and a low THD of < 0.01%, it delivers clear audio. This 1U rack-mountable unit offers extensive connectivity, including XLR and 1/4" TRS inputs and outputs, along with 12 headphone outputs, making it suitable for studios, rehearsal spaces, and live sound applications requiring multiple headphone feeds.
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 $199.99.
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-400 Rack-Mountable, 4-Channel Headphone Amplifier is available at bhphoto, starting at $199.99.
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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