A single bounce is bad enough, sometimes creating a three to four dB reduction speaker output at and around the self- cancel frequency. But to have two walls reflecting waves back to the speaker at the me time is nearly intolerable. Whenever we have a speaker near a corner, there results three wall reflections, three corner reflections, and one tricorner reflection. In order to keep the self-cance11ing effect to a minimum, every one of these round trip distances should be as different from one another as possible. The most obvious setup is to keep the distances the three walls as different as possible.