A growth number of large spaces have been built in recent years and their sound fields are important for the acoustic design and crowed evacuation. The aim of this paper is to study the characteristics of Sound Pressure Level (SPL) in those spaces. The decreasing trend of total and reverberant SPL with source-receiver distance was studied by using the image method. The results showed that total SPL decreased in an exponential trend in extra-large spaces and the reason was not only the direct energy but also the exponentially decreasing reverberant energy, in which first-order reflections occupied a large part of reverberant energy. Furthermore, taking air absorption into account in extra-large space was necessary but it was difficult to become the main way of sound energy absorption except for extremely large spaces.
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