Hi, in this tutorial I’ll show you something about the Speaker object, one of the most interesting newcomers introduced with Blender 3D 2.6.
I’m Italian, so I’m sorry for my bad English!!! 
Text version (and more tutorials): http://www.cg-village.com/blender-3d-tutorials/38-blender-3d-2-6-tutorial-speaker-objects-and-mixdown.html