Abstract
The Christchurch Town Hall (2650 seats), which was opened in 1972, was designed primarily as a choral symphony hall. Reverberation time (125 Hz–2 kHz) in excess of 2.2 s with the hall full, is provided by a volume of 20 500 m3 and generally reflective surfaces. The basic design aim, audibility of early lateral reflections, is achieved by large interior oblique reflectors which hang in the space from the walls at about half-ceiling height. They are, thus, within and independent of boundaries of the reverberant volume. The resulting temporal and spatial distribution of energy in the reflection sequences gives this hall an unusual combination of reverberance, envelopment, and clarity. Measurements of T60, T15, EDT, and integrated early energy are presented and discussed in explanation of the combination of reverberance and clarity experienced in the hall.
Published Version
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