Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
198 words
A low-frequency loudspeaker having a main support structure, a voice coil supported by said main support structure, a supporting dome connected to the coil, and a main conical diaphragm supported by said dome at an inner periphery and by said main support structure at an outer periphery, said loudspeaker having high efficiency and overcoming a tendency to provide excessive midrange acoustic output, characterized by a circular attenuator disk of a low-density material secured axially onto and covering the central radiating surface area of said diaphragm, said disk being attached adhesively at its periphery to said diaphragm at a circle spaced inwardly from the outer periphery of said diaphragm, said disk being attached at its center to said dome and lying substantially in a single plane, thereby forming an airtight chamber between said disk and said diaphragm, wherein said excessive midrange acoustic output efficiency is dissipated within said chamber, only the excessive midrange acoustic output efficiency of the loudspeaker being attenuated, all without altering the electromagnetic circuit properties of the loudspeaker which are responsible for its tendency toward excessive midrange output efficiency, thereby equalizing the loudspeaker''s acoustic output performance to a substantially uniform level over its entire operating range.
Claim 2
Dependent Claim
198 words
A low-frequency loudspeaker having a main support structure, a voice coil supported by said main support structure, a supporting dome connected to the coil, and a main conical diaphragm supported by said dome at an inner periphery and by said main support structure at an outer periphery, said loudspeaker having high efficiency and overcoming a tendency to provide excessive midrange acoustic output, characterized by a circular attenuator disk of a low-density material secured axially onto and covering the central radiating surface area of said diaphragm, said disk being attached adhesively at its periphery to said diaphragm at a circle spaced inwardly from the outer periphery of said diaphragm, said disk being attached at its center to said dome and lying substantially in a single plane, thereby forming an airtight chamber between said disk and said diaphragm, wherein said excessive midrange acoustic output efficiency is dissipated within said chamber, only the excessive midrange acoustic output efficiency of the loudspeaker being attenuated, all without altering the electromagnetic circuit properties of the loudspeaker which are responsible for its tendency toward excessive midrange output efficiency, thereby equalizing the loudspeaker''s acoustic output performance to a substantially uniform level over its entire operating range.
Claim 3
Dependent Claim
20 words
The low-frequency loudspeaker of claim 1 wherein said attenuator disk covers apProximately 40 percent of the area of said diaphragm.
Claim 4
Dependent Claim
37 words
The low-frequency loudspeaker of claim 1 wherein said attenuator disk is of neoprene foam having a closed cell structure, a density of about ten to twelve pounds per cubic foot, and a thickness of about one-eighth inch.