Patent ID: 7931116

Claim:
A trirectangular tetrahedral subwoofer enclosure, comprising: a first face, a second face, a third face, and a fourth face, wherein the first face, the second face, the third face, and the fourth face are substantially triangular; a first corner, wherein the first corner is at an intersection of the first face, the second face, and the third face; a second corner, wherein the second corner is at an intersection of the first face, the second face, and the fourth face; a third corner, wherein the third corner is at an intersection of the first face, the third face, and the fourth face; a fourth corner, wherein the fourth corner is at an intersection of the second face, the third face, and the fourth face; wherein an angle between the first corner and a midpoint between the third corner and the fourth corner, having the second corner as its vertex, is substantially ninety degrees; and wherein an angle between the third corner and the fourth corner, having the second corner as its vertex, is substantially ninety degrees; and wherein an angle between the first corner and the third corner, having the second corner as its vertex, is substantially ninety degrees; and wherein an angle between the first corner and the fourth corner, having the second corner as its vertex, is substantially ninety degrees; and wherein a first dihedral angle between the first face and the third face is substantially equal to the inverse cosine of the square root of two thirds of a radian, subtracted from pi divided by two radians; and wherein a second dihedral angle between the second face and the third face is substantially equal to the inverse cosine of the square root of two thirds of a radian, subtracted from pi divided by two radians; and wherein a third dihedral angle between the fourth face and the third face is substantially equal to the inverse cosine of the square root of two thirds of a radian, subtracted from pi divided by two radians; and at least one active driver, wherein one of the at least one active driver is a subwoofer driver attached to the third face, and wherein every one of the at least one active driver has a free air resonant frequency less than one hundred Hertz.