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Amplifier

The power stage that raises an audio signal enough to drive a speaker.

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Why it matters

The amplifier is not just a watt number.

It must drive the real impedance of the speaker, stay inside its heat and current limits, and avoid clipping at the level the build needs. A good amplifier match gives clean headroom. A bad match can shut down, distort, or damage parts.

How it works

An audio source sends a low-level signal. The amplifier increases that signal so it can move a driver.

The speaker asks the amplifier for current. Lower impedance asks for more current. Higher output asks for more voltage swing. The power supply feeds the amplifier stage, and protection circuits step in when heat, current, voltage, or faults get unsafe.

Common mistakes

Simple example

Amplifier parameters Amplifier parameters explain what load the amp can drive, how much clean output it can deliver, how much gain it has, and where it clips, heats, or protects itself. Wattage Wattage is electrical power. In audio, it helps describe amplifier output and speaker power handling, but it does not directly tell you loudness or sound quality. Impedance Impedance is the electrical load the amplifier sees. It changes with frequency, so a speaker marked 8 ohms is not 8 ohms everywhere. Sensitivity Sensitivity tells you how loud a speaker gets from a known input. It helps estimate output, amplifier needs, and how well drivers will match.

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