Julian Treasure talks about his favorite topic of sound and how to keep it as sound and not create noise. He demonstrated to the audience what bad sound is. He suggests sound systems that are good enough and well designed. Unfortunately, often loudspeakers are too far away from the ears e.g. in hotels and bars, in interior spaces. This produces bad or unpleasant sounds for the people sitting in these spaces and talking to each other. The loudspeakers might produce good sound in their location high above in the ceiling, but by the time the sound reaches the audience it vibrates and loses its quality. It is bad sound and becomes a nuisance for people in these spaces.