Asymmetrical loudspeaker enclosures with enhanced low frequency response
View Patent ↗An embedded loudspeaker system is set forth incorporating at least two asymmetric enclosures having different but overlapping frequency responses in order to achieve a substantially flat frequency response. At least one of the speaker enclosures is preferably ported (bass-reflex system) to provide as much output as possible in the low-frequency range. By using a plurality of speakers at least one of which has a bass reflex enclosure, a monophonic system is provided with a flat frequency response. The dimensions of the speaker enclosures are chosen such that the anti-resonance of one loudspeaker enclosure is compensated for by the resonance of another speaker enclosure, without making use of damping, so that no “notch” appears in the frequency response of the combined system at the listening position.
1. A speaker system disposed within a telephone set, comprising:
a first of a pair of left and right loudspeakers coupled with a first enclosure configured to have a first frequency response at an ear reference point, that includes an anti-resonance; and
a second of said pair of left and right loudspeakers coupled with a corresponding further enclosure that is smaller than said first loudspeaker enclosure and is configured to have a further frequency response at said ear reference point, including a resonance that overlaps and compensates for said anti-resonance, such that said first and further loudspeakers provide a substantially flat combined frequency response.
2. The speaker system of claim 1 , wherein at least one of said first and further loudspeaker enclosures is ported to provide enhanced low frequency response.
3. The speaker system of claim 1 , wherein each of said first and further loudspeaker enclosures comprises a front cover with an opening, an acoustically transparent grill mounted in said opening, a gasket for securing said grill in place and supporting said respective first and second of said pair of loudspeakers, and a rear cover, so that said first and further loudspeaker enclosures are airtight and defined with respective predetermined volumes.
4. The speaker system of claim 3 , wherein said rear cover includes a bass-reflex port.
5. The speaker system of claim 4 , wherein the predetermined volume of said first loudspeaker enclosure is 60 cc and the predetermined volume of said further loudspeaker enclosure is 25 cc.