Amplifier amplifier ndi chida chomwe chimamanganso mawu omvera pazomwe zimatulutsa mawu. Voliyumu yamphamvu yomangidwanso komanso mulingo wamagetsi ziyenera kukhala zowona-zowona, zogwira mtima komanso zopindika pang'ono. Mawotchiwa ali pafupi 20Hz mpaka 20000Hz, kotero amplifier iyenera kukhala ndi mayankho abwino pafupipafupi (yaying'ono mukamayendetsa cholankhulira chofupikitsa, monga woofer kapena tweeter). Kutengera kugwiritsa ntchito, mulingo wamagetsi umasiyanasiyana kwambiri, kuyambira milliwatt mahedifoni mpaka ma watts angapo a TV kapena PC audio, mpaka makumi a watts a "mini" home stereo and car audio, kupita kunyumba yamphamvu kwambiri komanso zomvera zamalonda Dongosolo’ma watts mazana ndi okwanira kukwaniritsa zofunikira za sinema kapena holo yonse

Chokulitsira mawu ndi chimodzi mwazinthu zofunika kwambiri pazogulitsa zamagetsi ndipo chimagwiritsidwa ntchito kwambiri pamagetsi azogula. Ma amplifiers amagetsi amagetsi nthawi zonse amakhala olamulira pamsika wama audio amplifier chifukwa chosokonekera kwambiri komanso mawu abwino. M'zaka zaposachedwa, ndikudziwitsidwa kwa zida zonyamula ma multimedia monga MP3, PDA, mafoni am'manja, ndi makompyuta amakalata, magwiridwe antchito ndi mphamvu yazingwe zamagetsi sizinakwaniritse zofunikira pamsika, pomwe ma amplifiers amagetsi a Class D akuchulukirachulukira odziwika bwino chifukwa chokwanira kwawo komanso kukula kwake. Kukonda. Chifukwa chake, ma amplifiers opanga mphamvu kwambiri a Class D ali ndi phindu lofunika kwambiri pakugwiritsa ntchito komanso chiyembekezo chamsika.

Kukula kwa ma amplifiers amawu adakumana ndi magawo atatu: chubu lamagetsi (chubu chotsukira), transipor yopumira, komanso chubu lamunda. Chotulutsa mawu cha chubu chimakhala chofewa, koma ndichachikulu, chimagwiritsa ntchito mphamvu zambiri, chimakhala chosakhazikika kwambiri, komanso sichimayankhidwa pafupipafupi; bipolar transistor audio amplifier imakhala ndimafupipafupi band, zazikulu zazikulu, kudalirika kwambiri, moyo wautali, komanso kuyankha kwapafupipafupi Zabwino, koma kugwiritsa ntchito kwake kwamagetsi mwamphamvu ndi kulimbana ndizazikulu kwambiri, ndipo magwiridwe antchito ndi ovuta kusintha; chophunzitsira cha FET chimakhala ndi mawu ofananira ndi chubu chamagetsi, ndipo mawonekedwe ake ndi otakata, ndipo koposa zonse, kulimbana kwake ndikochepa, Kotheka kukwaniritsa bwino.