Patent ID: 7142680

Claim:
A loudspeaker capable of radiating sonic energy having improved directional characteristics over a selected frequency spectrum, comprising; a lower-frequency transducer, the lower-frequency transducer having a first longitudinal axis; a high frequency transducer, the high-frequency transducer having a second longitudinal axis, the high-frequency transducer being mounted such that the first longitudinal axis is coaxial with the second longitudinal axis; a lower-frequency waveguide, the lower-frequency waveguide having a third longitudinal axis and being coupled to the lower-frequency transducer such that the third longitudinal axis is substantially coaxial with the first and second longitudinal axis; the lower-frequency waveguide having a first diameter and a high-frequency waveguide, the high-frequency waveguide having a fourth longitudinal axis and being coupled to the high-frequency transducer such that the high frequency waveguide is concentric with the low frequency waveguide and the fourth longitudinal axis is substantially coaxial with the first, second and third longitudinal axis.