In my high-school days, I visited a friend whose well-to-do dad proudly demonstrated his new Quad ESL system for us. First up was a recording of a man with heavy footsteps traversing the space from left to right. Next came a speeding police car, siren engaged, complete with Doppler tail. I found it impressive, and a little lame at the same time. My friend and I, in love with our own artsiness, preferred Fear of Music by Talking Heads and Drums and Wires by XTC, or (in a pinch) U2's Boy.