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.