The disclosure concerns itself with labyrinth speakers systems which are provided with a plurality of internal partitions which are generally spaced from each other and are provided with apertures therein to form at least one tortuous path for a backwave generated by a loudspeaker. In one embodiment, the partitions are substantially cylindrical walls concentrically aligned with each other. The cylindrical walls have different diameters to form annular intermediate chambers. Other embodiments described include partitions which are planar and are substantially rectangular in shape. These partitions are spaced from each other along an axis of symmetry and are alternately provided with peripheral and central openings so that the backwave, while propagating between an initial and a final chamber of the enclosure, are successively broken up into a substantially annular shape and subsequently reconstituted. The intermediate chambers, including the apertures formed therein, substantially increase the overall surface area and form a tortuous path having an increased number of bends to thereby increase the effective length to the backwave.

This invention relates to a loudspeaker having a plurality of sound collecting tubes attached to the rear of the speaker frame or the sound collecting tubes forming the speaker frame for collecting and directing sound waves emitted toward the rear of the speaker diaphragm. The sound collecting tubes are particularly useful for directing and boosting sound waves emitted from the rear of the speaker which is otherwise dissipated or absorbed by the loudspeaker housing material or insulation. In addition, conventional or specialized sound horns may be readily attached to the outlet end of the sound collecting tubes which can direct sound waves emitted by the speaker to any desired direction.

An improved speaker system includes an open tube arrangement operated in conjunction with one or more closed tube components. The system includes a speaker having a frontal side which is positioned proximate an inlet end of an open primary tube. The tube may be provided with a plurality of apertures therethrough along the length thereof for the creation of even harmonic overtones. These apertures may be equally or unequally spaced as desired. Slits are provided at opposite ends of the primary tube and first and second additional tubes each close at one end surround opposite ends of the primary tube including the intensify base notes and enhance the fundamental wave lengths and odd harmonic overtones.

A loudspeaker installation for the rear shelf of a motor vehicle. A lightweight, ribbed loudspeaker enclosure is fastened to the underside of the rear shelf so as to be suspended into the trunk of the vehicle and disposed about a conventional loudspeaker flush-mounted to the rear shelf. The enclosure acoustically isolates the vehicle passenger compartment from the trunk, and a duct disposed within the enclosure communicates with the passenger compartment to enhance the low frequency audio response of the installation.

A speaker system comprises a plurality of serially connected, angularly disposed hollow tubes having a total mean axial length of one-quarter wavelength of the desired lowest frequency response of the speaker system, the speaker system providing, with a single small speaker, the entire frequency range normally provided from a woofer, a midrange and a tweeter while eliminating the phase distortion and the phase problems resulting from dividing networks.