Author(s)

T.J. Cox & W.J. Davies

Abstract

Two dimensional boundary element methods have been used to investigate techniques which can help reduce the seat dip effect in concert halls. These predictions have used simple approximate geometries. The results indicate that the use of a pit below the seating can considerably reduce the dip effect. The predicted results have been compared to measurements for the simplest cases as well as more complex and realistic set ups. The subjective significance of the reduced seat dip will be discussed. 1 Introduction The seat dip effect is the name given to the selective low-frequency attenuation suffered by sound travelling at grazing incidence over seating. It is caused by interference between the direct sound travelling from the stage of an auditorium and multiple

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