amplifier
n//ˈeːm.plə.fɑɪ.ə//förstärkare
Anything that amplifies, or makes something larger or more intense.
(electronics) An appliance or circuit that increases the strength of a weak electrical signal without changing the other characteristics of the signal.
(music) A portable encasement that houses a large speaker, used to amplify voices and musical instruments at live performances.