7.12: Power Amplifiers

Understanding Sound From Ear to Engineer · LibreTexts

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    From LibreTexts, under CC BY-SA 4.0, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    Power Amplifiers

    Amplifiers provide the electrical energy required to drive speakers. Key considerations include:

    • Wattage output
    • Impedance matching
    • Headroom and distortion levels
    • Modern amps are solid-state (light, efficient) or tube-based (warm, musical).

    Power amplifiers are also needed to provide sufficient power so that the signal does not clip. Clipping occurs when the amplifier is pushed beyond its maximum capability, creating distortion that can damage both the sound quality and the speakers themselves.

    It is also important to note that a 3 dB increase in sound level requires twice as much amplifier power. This exponential relationship between sound pressure level (SPL) and amplifier wattage highlights the importance of selecting an amplifier with enough headroom to handle peaks in the audio signal without distortion.

    This page titled 7.12: Power Amplifiers was last modified on Fri, 01 May 2026 02:54:47 GMT and is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Geoffrey Dunbar.