Watch the remake of 3:10 to Yuma. There's a scene when Russell Crowe's gang is robbing a stage coach. Someone fires a gun into the armoured coach. You hear the gunshot in one of the main speakers, then the travels past your head, ricochets off a back wall in one of the rear speakers, then impacts on the opposite side wall. It's a nice introductions of what a set of rears can add.

"Not throwing my hands up or my dress above my ears don't mean I ain't awestruck." Al Swearengen