greygoose
Super Freak
Sorry I am a bit of a Audio/Video geek!
In english it means all the dialogue is sent to the centre speaker if you had a home cinema set up. If you play it through just 2 speakers on a TV then all 6 or 7 channels are mixed into one so when they speak it will be quieter then the music and explosions etc.
Some Blu-ray players or TVs have options which either make sure all audio is the same volume or to convert it into just 2 channels for 2 speakers. Hope that is more clear!
Sound!