Acoustics – Diaphragm and enclosure – With horn
Reexamination Certificate
2010-09-22
2011-11-29
Phillips, Forrest M (Department: 2832)
Acoustics
Diaphragm and enclosure
With horn
C181S148000, C381S335000, C381S338000, C381S342000
Reexamination Certificate
active
08066095
ABSTRACT:
A compact bass speaker cabinet uses a long, narrow, tapered waveguide that acts as does a small radial portion of the air outside a large pulsating sphere, and has the same bass response as the large pulsating sphere. The smaller end is closed and the longer end is open. In one embodiment the inside of the waveguide is a rectangle about an inch thick and substantially as wide as the speaker or speakers that are mounted on the wider surface close to or slightly overlapping the closed end; and the inside surfaces are tapered so that they meet at a point which lies beyond the closed end by a distance equal to the radian wavelength of the longest sound wave that is to be produced.
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