yeah it is know as "dynamic range control" it is normally a option in the dvd playback software.
FYI it is not a bug or something it is on purpose that loud noises are loud in a movie because it better conveys a sence of realism when you listen at reference levels that are around 75db.http://www.howstuffworks.com/question124.htm
This site has more info about sound levelshttp://www.avforums.com/forums/archi...p/t-63165.html
and here is more talk of how that works in a home theater context
The basic idea is to have a dialoge be the same loudness as a person talking to you at a normal level so a explosion will be much louder.
The dynamic range control limits the range between how load and how quiet a given dvd will sound so quiet sounds are louder and loud sounds are softer for a given volume setting.