An audio power amplifier is a device that receives an electronic audio signal, typically one that is low-powered, and amplifies it, generally with the goal of playing the sound through a speaker. The device is generally part of a chain, appearing in the middle between an input device that generates the audio and an output device that plays the audio. A common example is to have a record turntable that sends a low-powered electronic signal to the amplifier, which then amplifies the signal before it is received by the speakers.
Although audio amplification circuits are relatively simple, their complexity is generally related to the difficult in producing clean sounding audio. Many amplifiers are high-power devices as they must pass a powerful enough signal to a speaker in order for the volume to be acceptable. Audio distortion is also a problem when attempting to create an audio amplifying circuit, particularly in modern times when many devices an interrupt a signal as it is being sent along a cable. High-quality amplifiers are an important part of any Hi-Fi setup and it is possible to spend thousands of pounds on high-quality audio amplifiers.
Amplifier ya sauti ni kifaa ambacho hupokea ishara ya sauti ya elektroniki, kwa kawaida moja ambayo ni ya nguvu ya chini, na kuiongeza, kwa ujumla kwa lengo la kucheza sauti kupitia msemaji. Kwa kawaida, kifaa hicho ni sehemu ya mnyororo, inayoonekana katikati kati ya kifaa cha kuingia ambacho hutengeneza sauti na kifaa cha kutoka ambacho hucheza sauti. Mfano wa kawaida ni kuwa na rekodi turntable kwamba anatuma chini-powered elektroniki ishara kwa amplifier, ambayo kisha amplifies ishara kabla ya kupokea na wasemaji. Ingawa mzunguko wa kupanua sauti ni rahisi, utata wao kwa ujumla unahusiana na ugumu wa kutengeneza sauti safi. Amplifiers nyingi ni vifaa vya nguvu ya juu kama wao lazima kupita ishara nguvu ya kutosha kwa msemaji ili kwa kiasi kuwa kukubalika. Uharibifu wa sauti pia ni tatizo wakati wa kujaribu kuunda mzunguko wa kuimarisha sauti, hasa katika nyakati za kisasa wakati vifaa vingi vinakatisha ishara wakati inatumwa kwenye kebo. Amplifiers ya ubora wa juu ni sehemu muhimu ya kuanzisha yoyote Hi-Fi na inawezekana kutumia maelfu ya pauni juu ya amplifiers ubora wa juu wa sauti.