Abstract: A speaker with an embedded sound enhancement module includes a magnet, a pole piece positioned within the magnet, a sleeve surrounding the pole piece, a conductive wire coil wound around the sleeve between the magnet and the pole piece, a dust cap or diaphragm attached to a circumference of the sleeve, a speaker cone surrounding the dust cap, and an enclosed chamber having an aperture to access an internal volume of the chamber and an alternative density transmission medium (ADTM) positioned within a portion of the internal volume.

Abstract: An acoustic impedance matching enclosure is provided having a driver loaded into a chamber buffering the throat/mouth of a closed loop transmission line. Transmission line consists of a termination member, outer and inner enclosure walls, high-density lining and throat/mouth area. Transmission line eliminates internal random standing waves while providing variable-frequency standing waves that through superposition of the waves compensates for mass-acceleration loss of the high-end of the driver output while damping the resonance of the driver. Alternative application of the acoustic impedance matching enclosure is that of compression loading the driver directly into the closed loop transmission line and using an acoustic low pass filter to translate the output into low frequencies only through a port.

Abstract: An acoustic impedance matching enclosure is provided having a driver loaded into a chamber buffering the throat/mouth of a closed loop transmission line. Transmission line consists of a termination member, outer and inner enclosure walls, high-density lining and throat/mouth area. Transmission line eliminates internal random standing waves while providing variable-frequency standing waves that through superposition of the waves compensates for mass-acceleration loss of the high-end of the driver output while damping the resonance of the driver. Alternative application of the acoustic impedance matching enclosure is that of compression loading the driver directly into the closed loop transmission line and using an acoustic low pass filter to translate the output into low frequencies only through a port.

Abstract: The subwoofer category of audio component is the newest category for speaker systems. The idea of adding the deeper bass tones using a separate loudspeaker has been around for some time but the category only came to fruition with the promotion of the home theater. The home theater application has made no particular reference to placement of the subwoofer in the living environment but practical implementation says place it wherever it sounds best. The ambiguous acoustic conditions that exist in various locations preclude prediction or conclusions in a timely manner of the best location for placing the subwoofer in a room. If wiring was included as part of a custom installation to place a subwoofer in an environment it may be decided later that it is not the best location. It may be a requirement that an additional unit be located in a place not originally calculated or prepared for.

Abstract: A hybrid bass reflex loudspeaker system capable of optimized sub-bass (<250 Hz) response. The basic low frequency loudspeaker system incorporates a ported cabinet, an electromechanical driver, a virtual acoustic radial transmission line (VARTL) and a radial right angle wave-guide (RRAWG). The aperiodic VARTL is disposed around and in front of the cone of the driver so as to allow the driver to maintain loading to very low frequencies, while simultaneously isolating the driver from reflected signals acoustic summation or stimulus. The VARTL slows the speed of the wave, thereby causing delay and intentional loading of the driver cone while, by the way of radial expansion, allows adequate exit velocity VARTL enhanced loading increases the effective isolation of driver and port to enhance the depth of the cone null at resonance to approach infinity.