Patent ID: 8275164

Claim:
A generally tube-based transmission line speaker enclosure comprising: (a) an outer main enclosure with an inner cavity; (b) a speaker driver disposed in a first side of the outer main enclosure, a magnet of the speaker driver faces the inner cavity of the outer main enclosure; (c) an exit port disposed in a second side of the outer main enclosure opposite the speaker driver, wherein a first exit port wall and second exit port wall each extend into the inner cavity of the outer main enclosure a distance between about ¼ to ¾ a length of the outer main enclosure as measured from the first side to the second side; and (d) an inner sub enclosure wall disposed in the inner cavity of the outer main enclosure, the inner sub enclosure comprises a vertex having a generally curved V-shaped outside and a rounded inside, the outside of the vertex facing the magnet of the speaker driver, a first outer wall extending from a first end of the vertex, and a second outer wall extending from a second end of the vertex, the first outer wall is positioned between a third side of the outer main enclosure and the first exit port wall with spaces between, the second outer wall is positioned between a fourth side of the outer main enclosure and the second exit port wall with spaces between, the outside of the vertex has an angle of between about 40 to 80 degrees, wherein the vertex is either separated from the magnet of the speaker driver by a gap or is securely attached to the magnet of the speaker driver, the gap being between about ½ to ½ a size of the speaker driver, wherein sounds waves exiting the speaker driver are diverted via the vertex either (a) between the first outer wall of the inner sub enclosure wall and the third side of the outer main enclosure, then between the first outer wall of the inner sub enclosure wall and the first exit port wall, then through the exit port walls and exit port, or (b) between the second outer wall of the inner sub enclosure wall and the fourth side of the outer main enclosure, then between the second outer wall of the inner sub enclosure wall and the second exit port wall, then through the exit port walls and exit port, wherein back waves generated by the speaker driver can have total travelling distance from a speaker cone of the speaker driver to the exit port of about ¼ wavelength of a tuned frequency.