Multiple driver loudspeaker system

H - Electricity – 04 – R

Patent

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181/2, 179/9

H04R 1/28 (2006.01) H04R 5/00 (2006.01)

Patent

CA 1087104

MULTIPLE DRIVER LOUDSPEAKER SYSTEM Abstract of the Disclosure A loudspeaker system comprising means defining an enclosure for accommodating at least one loudspeaker driver. The enclosure includes cavity defining means formed with at least one driver opening for accommodating the loudspeaker driver and characterized by acoustic compliance. The loud- speaker driver is seated in the driver opening. The cavity defining means also has at least one mass opening for accom- modating means for providing acoustic mass that resonates with the acoustic compliance at a predetermined mass-compliance resonant frequency in the low range of audio frequencies. The means for providing acoustic mass is seated in the mass open- ing. The loudspeaker system has a fundamental resonance determined by the volume of the enclosure and the electro- mechanical characteristics of the driver at a frequency sig- nificantly higher than the predetermined mass-compliance resonant frequency. Active equalizing means is also provided and includes means for establishing a substantially uniform radiated power response of the system as a function of fre- quency at least in the range of frequencies between the pre- determined mass-compliance resonant frequency and the loud- speaker system fundamental resonance. The equalizing means also comprises means for sharply attenuating signal spectral components below a predetermined frequency at or slightly below the predetermined mass-compliance resonant frequency. - 1 -

339720

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