Surround sound check

Is there a surround sound check for Apple TV? (center, left, right, left surround, right surround, subwoofer)

I was at a friend's house a month ago watching horror musicals and all the singing was coming from the rear speakers. On other occasions I've heard dialog coming from the left and right and not the center speaker. I don't own an Apple TV so I don't know how to advise him in this matter.

Second question: What's a polite way for a guest to tell a host that their sound setup is wrong and they need to fix it? This has been going on for years and my lip is bleeding. (See: http://www.usingenglish.com/reference/idioms/bite+your+lip.html)