Abstract: A loudspeaker assembly includes a vibrating element which generates pressure waves in a first predetermined frequency range which propagate in a first forward direction and a second backward direction. A driver drives the vibrating element. A first diffuser uniformly diffuses the forward waves. A tuner selects back waves in a second predetermined frequency range within said first predetermined frequency range. The tuner includes a second diffuser for diffusing the back waves within said second frequency range such that the selected back waves and the front waves are in phase.

Abstract: An electronic audio signal amplifier and loudspeaker system comprises a preamplifier circuit, a plurality of L electronic crossover networks, a plurality of M output amplifiers and an associated plurality of M loudspeaker assemblies. The electronic crossover networks conjugate an input signal into at least low, mid and high frequency bands which do not overlap for broadcast form at least three loudspeaker assemblies particularly designed for such broadcast and for alleviation of intermodulation distortion. The system delivers an omnidirectional sound at equivalent acoustic energy to listeners over the entire audible spectrum with limited intermodulation distortion. A center channel loudspeaker assembly of the system comprises first and second ported chambers, the second chamber being filled with a sound-absorbent material to attenuate acoustic energy at certain frequencies broadcast from a woofer of the assembly.

Abstract: An improved loudspeaker assembly for frequencies higher than approximately 6 kHz, i.e., a tweeter assembly, is disclosed. The tweeter assembly includes a dome tweeter driver for delivering high frequency sound to a listener, and a cylindrical housing for mounting the tweeter driver in a horizontal plane. A centrally located aperture is provided in the top surface of the housing for receiving the dome portion of the tweeter, and a plurality of concentric annular ridges are also provided, and are spaced outwardly from the tweeter dome. The annular ridges function to reflect sound energy transmitted off the dome structure, and are used to disperse the high frequency energy in a horizontal direction within the listening room.

Abstract: A waterproof ground audio speaker apparatus has a speaker housing having a cylindrical sidewall, one open end and a closed end. A hollow cylindrical inner housing has a pair of open ends and is attached to the speaker housing with its walls in a spaced relationship to the walls of the speaker housing to form a passageway between the walls of the inner housing and the walls of the speaker housing. A loud speaker is mounted in the hollow inner housing facing one open end thereof for directing acoustical energy out the open end of the speaker housing and directing the backwave of the speaker through the hollow inner housing and through the passageway between the inner housing and the speaker housing to the open end of the speaker housing. A rigid domed supporting cover extends over the opening of the speaker housing and a filter membrane cover covers the open end of the speaker housing to protect the inside of the speaker enclosure.