Patent ID: 7436972
Filing Date: 2008-10-14
Classification: H04R

Abstract:
1. A loudspeaker, comprising: a loudspeaker driver having a front end and a rear end; a first tube having a closed, first end secured to the base of the loudspeaker driver, the first tube extending away from the rear end of the driver and having an open rear end; a second tube of larger cross sectional dimensions than the first tube extending over the first tube from a rear end towards the front end of the driver, the rear end of the second tube being spaced from the open rear end of the first tube, the second tube having an open front end secured to the driver; a third, inner tube of smaller cross-sectional dimensions than the first tube and extending through the rear end of the second tube and into the first tube towards the first end of the first tube; and the third tube having a rear end and an open front end spaced from the first end of the second tube end; the first, second, and third tubes extending at least substantially coaxially with the loudspeaker driver; whereby successive segments of a transmission line are defined by the gap between the first and second tubes, the gap between the first and third tubes, and the interior of the third tube.