Auditorium

space in a theater room used to seat or contain audiences

An auditorium (plural auditoriums, or less commonly auditoria) is the room in a theatre, cinema, concert hall, or other place where the audience is located to hear or watch the show. Auditoriums are made with great sound. The sound is easily heard by everyone in the auditorium.

The auditorium of the Municipal Theatre, Regensburg, Germany