Patent ID: 8594358

Claim:
An acoustic device, comprising, an acoustic enclosure bounded by a three dimensional bounding figure said enclosure having walls defining an enclosure interior volume, an acoustic driver having a first surface and a second surface, first and second surfaces radiating along a first axis, wherein said acoustic driver is mounted in said acoustic enclosure so that said first surface faces said enclosure interior volume, a cavity in said acoustic enclosure lying substantially within said bounding figure and comprising a cavity opening to an external environment, a first passive radiator having a first surface and a second surface and an intended direction of motion along a second axis, mounted in said acoustic enclosure so that said first passive radiator first surface faces said cavity and said passive radiator second surface faces said enclosure interior volume and, a second passive radiator having a first surface and a second surface and an intended direction of motion along a third axis, said second passive radiator mounted so that second passive radiator first surface faces said cavity and said second passive radiator second surface faces said enclosure interior volume, wherein said acoustic enclosure is constructed and arranged so that all acoustic paths between said acoustic driver first surface and said cavity includes at least one of first passive radiator and said second passive radiator.