"The goal of producing a THX trailer is to create something that lets the audience experience the capacity of the sound system without being overwhelming … In fact, from a technical standpoint, 'Deep Note' just feels loud because it has a spectrum of frequencies that grows from small to large."
Gary Rydstrom, Pixar Animation
The TASA (Trailer Audio Standards Association) standard’s intent is to equalize the sound volume of theatrical trailers so that they more closely match the volume of the features that they precede.
[Related article - via boxoffice.com]
If you want to learn more about the TASA trailer certification process, you can check out the MPAA website or http://tmhlabs.com/tasa
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