Low frequency sound generation system for use in vehicular passenger compartments

摘要

A system for low frequency sound production in vehicular passenger compartments, comprising an electrodynamic driver, having a first acoustic mass and a first acoustic compliance; and a Helmhotz resonator, affixed to one side of said electrodynamic driver means and having a second acoustic mass and a second acoustic compliance, the second acoustic mass being affixed to a baffle facing the passenger compartment. The first and second acoustic mass have substantially similar magnitudes, and the Helmholtz resonator and the electrodynamic driver being substantially tuned to the highest and lowest frequencies of a desired passband, respectively, so as to provide a substantially flat pressure vas. frequency characteristic when the passenger compartment has dimensions generally smaller than one eighth wavelength of the lowest frequency.