Patent ID: 7835537

Claim:
A loudspeaker comprising: a baffle; at least one planar diaphragm transducer carried by said baffle and having a front surface for radiating acoustic energy therefrom; and a slotted waveguide adjacent the front surface of said at least one planar diaphragm transducer and sealing completely around opposing portions of said baffle; said slotted waveguide comprising a body having a slotted opening therein, and said at least one planar diaphragm transducer having an elongated rectangular shape aligned with the slotted opening; said slotted waveguide providing a horizontal directivity defined by less than a +/−6 dB variation over at least +/−75 degrees from an axis of said at least one planar diaphragm transducer and over a frequency range of up to about 20 KHz.