Perforated cinema screens are currently in widespread use in cinemas and dubbing stages, due to their high light-reflectivity. However, in the acoustical domain, such screens form a low pass filter which attenuates the high frequency response of the cinema loudspeakers. Recent studies have shown that the X-curve, which has long been adopted by the SMPTE as standard responses curve, primarily reflects this low pass filter action. It is therefore of significance to explore the ramifications of equalising the effects of this low pass filter, in order to provide a flat frequency response for listeners. This paper reports on measurements of the spectral content of several movies, and assesses the impacts on the headroom in the playback chain and the long-term power requirements of the loudspeaker drivers that equalisation of this type would impose with the spectral content of these movies.
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