Definition

Noun: An electronic device that increases the power (amplitude) of an audio signal, making the reproduced sound louder and strong enough to drive speakers or headphones.

Usage

The term "audio amplifier" is used to specify an amplifier designed specifically for sound reproduction, as opposed to amplifiers used for radio frequencies, instrumentation, or other purposes. It is a core component in sound systems. - The stereo system requires a separate audio amplifier to power the bookshelf speakers. - For the best sound quality, audiophiles often invest in a high-end audio amplifier.

Advanced Usage

• Integrated Amplifier: A single unit that combines a preamplifier (for source selection and volume control) and a power amplifier (which provides the power to the speakers).
  • The new receiver is an integrated audio amplifier with multiple digital inputs.
• Power Amplifier / Power Amp: Specifically refers to the component that provides the high-power output to the speakers, often used in conjunction with a separate preamplifier.
  • The concert venue uses massive power amplifiers to drive the main speaker arrays.

Variants and Related Words

• Amplifier (n): The general term for any device that increases the power of a signal. "Audio amplifier" is a specific type of amplifier.
• Preamplifier / Preamp (n): A device that amplifies a weak signal from a source (like a turntable or microphone) to a level suitable for input to a power amplifier.
• Receiver (n): An audio/video component that typically includes an audio amplifier, a radio tuner, and a preamplifier for switching between sources.

Synonyms

• Power amplifier (when used in the context of audio)
• Amp (common informal shortening)

Related Phrases and Technical Terms

• To drive speakers: This phrase describes the primary function of an audio amplifier.
  • This amplifier can easily drive a pair of 4-ohm speakers.
• Gain: The measure of how much an amplifier increases the signal's amplitude.
  • The gain setting on the audio amplifier was adjusted for the new microphone.

Noun

1. an amplifier that increases the amplitude of reproduced sound