Room design with parallel walls to a narrow, there is a phenomenon of Sonic rush back to the room (Sound Flutter) therefore making fixes a narrow rectangle to make the walls on both sides is out (Tilt) from each other. "in addition, the proportion of the most appropriate venue to listen to great sound. Not too narrow and not too wide. The proportion of
Walls width: length is 1: 1.2 the length of the room to get a good sound. Must not exceed 2 times the width.