measuring actual media with a spl meter is not the same as a constant tone. with media you have peaks and nulls, so unless it was some seriously consistent music you would not really get the loudness of the media. with music you can get an idea, but with movies its pretty pointless to do a realistic spl test.
for me, i have never thought to try to figure out what db i was watching my movies at. there is either not loud enough, too freaking loud, or just right (slightly loud).
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