| 摘要 |
A loudspeaker system for use as a subwoofer or other bass speaker system utilizes an enclosure with at least one speaker mounted therein and a port to form a bass reflex system. The bass reflex system is tuned to a selected low frequency range so that the acoustical output within such low range of the frequency spectrum of the loudspeaker system is enhanced while minimizing speaker cone excursion and distortion. Whereas the bass reflex speaker system loads the speaker at the selected low frequency range, a waveguide in the form of a quarterwave resonator is included in the loudspeaker system for loading the speaker at a higher frequency range which is still within the frequency range of the speaker system, so that acoustical output is enhanced and speaker cone excursion and distortion are minimized at the upper end of the frequency range. The resonator is designed to function as a quarterwave resonator within the upper frequency range. The resonator may comprise a tube or duct, located within the speaker enclosure together with one or more speakers. The tube or duct extends from the speakers to an opening in the front of the enclosure. The volume within the enclosure and outside of the tube or duct combines with the speaker and a port in the enclosure to form the bass reflex portion of the system.
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