The more sound absorption there is in a room, the lower the noise level will be. It has been shown that physical reduction of sound pressure levels (= less noise) in a room also results in additional sound reduction by psychological reaction: people talk more quietly.
Mida rohkem on ruumis heli neelduvust, seda madalam on müratase. On tõestatud, et helirõhu taseme füüsiline alandamine (= vähem müra) ruumis toob kaasa ka heli vähenemise psühholoogilise reaktsiooni tulemusena: inimesed räägivad vaiksemalt.