power amplifier: meaning, definition, pronunciation and examples

A preamplifier prepares a weak signal (e.g., from a microphone) by increasing its voltage and providing tone controls. A power amplifier then takes that prepared signal and boosts its power (current and voltage) to a level that can physically move speaker cones.

Typically, no. A power amplifier requires an input signal from a source like a preamplifier, mixer, or audio interface. It only amplifies; it does not select sources or control volume/tone on its own.

These letters refer to the amplifier's circuit design and how it handles the input signal. Class A is known for high sound quality but low efficiency (runs hot). Class D is highly efficient and compact, common in modern consumer electronics.

Not necessarily. Adequate wattage for your speakers and room size is important to avoid distortion. Excessive wattage can be wasteful, expensive, and risks damaging speakers if mismanaged. Matching the amplifier's power to the speaker's handling capacity is key.

An electronic device that increases the magnitude of an electrical signal's power.

Power amplifier is usually technical in register.

Power amplifier: in British English it is pronounced /ˈpaʊər ˈæmplɪfaɪə/, and in American English it is pronounced /ˈpaʊər ˈæmpləˌfaɪər/. Tap the audio buttons above to hear it.