Ma'anar ƙamus na "ikon sauti" shine adadin kuzarin sauti a kowane lokaci na raka'a wanda ke haskakawa daga tushen sauti a kowane bangare. Ana auna shi a watts kuma yana daidai da matakin matsa lamba a wani nisa da aka ba da shi daga tushen. Ana iya ƙididdige ƙarfin sauti na tushen sauti daga matakin matsi na sauti da nisa daga tushen, a ɗauka cewa sautin yana haskakawa iri ɗaya a kowane bangare.