Good and audible reproduction of speech and/or music is a basic condition for successful presentation and information transfer. This applies universally, regardless of whether a simple presentation set is involved, or you want to equip an exclusive meetings room, or you want to use a public address system. Sound is important. But also complex in many situations. Many rooms are designed in a way that reflects sound from the floor and ceiling or encourages feedback via the microphone. BIS performs an extensive sound audit beforehand in order to prevent problems of this nature and we test the proposed solutions in a simulated environment. The result is optimum sound and music reproduction.