audio amplifier

audio equipment that amplifies the signal strength of a device such as a CD player or an electric guitar, typically for feeding loudspeaker boxes connected to it

en-US/ˈɑdiˌoʊ ˈæmpləˌfaɪɚ/
en-GB/ɔːdiːəʊ ˈæmplɪfaɪə/

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audio electronicsamplifier