ABSTRACT
This chapter deals with some absorbers that do not easily fit into categories, but are nevertheless important to airborne acoustics. The first subject is seating and audience absorption. In many auditoria, the seating and audience form the main absorption in the room, and consequently being able to correctly measure and predict the absorption coefficient of the seating and audience is very important. The second subject is how to make efficient absorbers from Schroeder diffusers. Researchers started by looking into why the absorption from Schroeder diffusers could be large, and ended up inventing a new style of absorber.
