If this is 35mm, it does need pre-emphasis and the lab should do that for
you if you ask them.
If it's 16mm, there is sort of a pre-emphasis standard but nobody really
follows it and lots of folks do aggressive equalization to make things sound
good on cheap classroom projectors while others don't.
If the lab is good, put your faith in the lab and let them do all the needed
pre-processing. If you don't trust the lab, try another lab.
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