I have two IMAX movies: Super Speedway Mach II and The Great Barrier Reef. Also I have also seen about 4 or 5 IMAX movies in an IMAX theatre. What I notice in all the IMAX films is that a lot of information (eg music etc)are recorded at relatively high levels in the rear surrounds. In the Great Barrier Reef I have to turn down the rear surround levels otherwise the sound of the ocean drowns out the centre channel. The surround levels were calibrated with the ol Radio Shack Analogue SPL meter.
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