It seems like previews/trailers are crazy loud. I was just at a movie and had to step outside into the foyer and wait for these to end so that I would not damage my hearing. The movie itself was a normal volume.
It seems to me that the sound volume in movie trailers is higher than the features themselves.
Are there any specific regulations or guidelines regarding movie trailer sound levels?
Is there any scientific evidence behind this observation and, if so, what is the reasoning behind having the sound that much louder?