And his mom, of course—and the upcoming movie. The Virginia Quarterly, which is rapidly becoming my favorite periodical, published Ellroy's afterword to the new edition of The Black Dahlia.
You take a 600 Hz tone and adjust the amplitude and phase relationships among three speakers. My buddy Jeff swears he saw this done in Jersey with just two loudspeakers, but I think he was just listening at such high volume that his eyeballs were compressing.