Abstract: A mountable sound pressure level (SPL) meter is described that includes a mechanism for mounting the SPL meter within an motor vehicle to measure motor vehicle audio system SPL values within the motor vehicle. The automotive SPL meter includes an internal microphone, or pressure sensor, that is designed for automotive use. Such pressure sensor improvements may include: use of a thicker and highly durable polytetrafluoroethylene (PTFE) microphone/pressure sensor diaphragm; use of a thicker, non-conducting gasket to increase microphone/pressure sensor excursion capability; use of a reduced number of microphone/pressure sensor back plate holes; and/or, reducing the diameter of microphone/pressure sensor back plate holes. The automotive SPL meter is highly resistant to operational environment temperature, humidity and decibel level extremes without sacrificing accuracy.

Abstract: A rebuildable low frequency loudspeaker driver has a replaceable diaphragm assembly. In a first embodiment, the peripheral edge of a loudspeaker driver diaphragm comprises a flexible surround and is releaseably supported within a matching basket having a peripheral mounting flange clamping surface to which a rigid ring-shaped clamping member or gasket is releaseably attached. A parts kit includes a replacement cone assembly with a frustoconical cone having an attached annular surround at the large cone end and a flexible spider attached near the small cone end, adjacent the attachment point for the cylindrical voice coil former. The spider includes a rigid ring mounted at the spider peripheral edge and dimensioned to be removably fastened to the driver basket. The driver basket includes a spider plateau region including a valley with sidewalls adapted to receive and center the spider rigid ring.

Abstract: An automotive sound pressure level (SPL) meter is described that includes a means for mounting the SPL meter within an motor vehicle to measure motor vehicle audio system SPL values within the motor vehicle. The automotive SPL meter includes an internal microphone, or Pressure sensor, that is designed for automotive use. Such Pressure sensor improvements may include: use of a thicker and highly durable polytetrafluoroethylene (PTFE) microphone/Pressure sensor diaphragm; use of a thicker, non-conducting gasket to increase microphone/Pressure sensor excursion capability; use of a reduced number of microphone/Pressure sensor back plate holes; and/or, reducing the diameter of microphone/Pressure sensor back plate holes. The automotive SPL meter is highly resistant to operational environment temperature, humidity and decibel level extremes without sacrificing accuracy.

Abstract: A low frequency loudspeaker driver has polygonal diaphragm surfaces. In a first embodiment, the peripheral edge of a loudspeaker driver diaphragm is polygonal, preferably hexagonal or six sided, wherein each of the six peripheral sides are of equal length and meet in radiused or rounded corners. The hexagonal loudspeaker driver is supported within a matching hexagonal section truncated pyramid shaped basket having a hexagonal peripheral mounting flange. The hexagonal woofer of a first embodiment is adapted to be mounted on a planar baffle in a variety of densely packed arrays such that virtually no wasted baffle space is visible between the driver basket peripheral edges. The faceted hexagonal diaphragm shape provides an increase in cone surface area of approximately ten percent as compared to conventional frustoconical woofers having circular peripheral edges.

Abstract: A system for installing a audio speaker in a desired orientation in a building construction.