One aspect of sound performance that is often overlooked is the effect directionality has on sound performance for people sitting outside of the “sweet spot”. At your desk, you can make sure your speakers are always pointing at you. In a room with one seat, you can obviously point all of the speakers at the listener. But most of us listening to audio in our homes have rooms with multiple listeners, and that makes directional effects important to understand. Also, directional effects determine the strength of reflections, always a problem for speakers indoors. The topic of directional effects in the propagation of waves is something that has been both an academic and professional interest of mine, I hope this article sheds a bit of light on how this theory applies to home theater.