Abstract: A ported speaker assembly includes an outer enclosure having a front opening. An inner frame of the speaker assembly is positioned at least partially within the outer enclosure and has an outer perimeter edge proximate the front opening of the outer enclosure. A resonator chamber is defined between an interior of the outer enclosure and an exterior of the inner frame. At least one speaker driver is mounted to the inner frame and configured to emit sound from a front end of the ported speaker assembly. A perimeter port is formed between the outer perimeter portion of the inner frame and the front opening of the outer enclosure. The perimeter port extends uninterrupted to encircle the outer perimeter portion. A plurality of fastener joints secure the inner frame to the outer enclosure, and at least some are distributed around multiple sides of the inner frame and positioned closer to the front opening of the outer enclosure than a rear end of the inner frame.

Abstract: A diffraction blade includes a diffraction blade body and a diffraction blade edge for widening an acoustic planar wave entering a waveguide horn having a subtended angle. The diffraction blade is disposed at a specific focal length from an acoustic diffraction slit of an acoustic generator to effectively form subdivided slits. The divided waveforms created by the diffraction blade have the same phase/time at the diffraction blade edge and as they recombine at the end of the diffraction blade body. Thus, the divided wave forms are mirror images of each other. The focal length, along with the width and horizontal length of the diffraction blade, are selected to ensure that the phase and direction of the acoustic planar waveforms from the subdivided slits match when recombined and exiting from a subtended angle of the waveguide horn as a widened acoustic planar wave.

Abstract: An acoustic waveguide includes a plurality of projections to redirect sound waves to obtain a desired wave front, such as a flat plane wave front or an asymmetric curved wave front. The waveguide includes two waveguide members that are mirror images of each other. The waveguide members have corresponding vanes and projections. The waveguide includes an essentially circular input opening for alignment with a compression driver and provides a substantially rectangular output opening from the waveguide.

Abstract: An acoustic waveguide includes a plurality of projections to redirect sound waves to obtain a desired wave front, such as a flat plane wave front or an asymmetric curved wave front. The waveguide includes two waveguide members that are mirror images of each other. The waveguide members have corresponding vanes and projections. The waveguide includes an essentially circular input opening for alignment with a compression driver and provides a substantially rectangular output opening from the waveguide.