Constrained layer damped loudspeaker enclosure
First Claim
1. A loudspeaker enclosure, comprising:
- a baffle board having at least one opening for mounting a transducer;
a plurality of walls connected to said baffle board which together with said baffle board define an enclosure;
said baffle board comprising a constrained layer damping arrangement having a first substrate, a second substrate, and a layer of isolation material sandwiched between and bonded to said first and second substrates;
wherein said isolation material comprises an energy absorbing thermoplastic alloy having a high material loss factor.
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Accused Products
Abstract
A loudspeaker enclosure having a constrained layer damping system for minimizing the propagation of vibrations and controlling the resonant modes of the enclosure. The enclosure has a front baffle board on which a plurality of transducers are mounted, and a plurality of other walls mounted to the baffle board to form a cabinet structure. The front baffle board comprises an interior substrate, an exterior substrate, and a constrained layer damping material sandwiched between and bonded to the two substrates. The constrained layer damping material comprises an energy absorbing thermoplastic alloy having a very high material loss factor. The other walls of the enclosure also comprise an interior substrate and an exterior substrate with a constrained layer damping material sandwiched therebetween. An extensional damping material may also be bonded to an interior surface of the interior substrates to further control vibrations in the enclosure.
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Citations
19 Claims
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1. A loudspeaker enclosure, comprising:
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a baffle board having at least one opening for mounting a transducer; a plurality of walls connected to said baffle board which together with said baffle board define an enclosure; said baffle board comprising a constrained layer damping arrangement having a first substrate, a second substrate, and a layer of isolation material sandwiched between and bonded to said first and second substrates; wherein said isolation material comprises an energy absorbing thermoplastic alloy having a high material loss factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A loudspeaker having a constrained layer damped enclosure, comprising:
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a baffle board and a plurality of transducers mounted to said baffle board; a plurality of walls connected to said baffle board which together with said baffle board define an enclosure; a plurality of internal braces extending between said baffle board and said walls for stiffening the walls of the enclosure to increase a resonance frequency of the enclosure; said baffle board comprising a constrained layer damping arrangement having a first substrate, a second substrate, and a layer of isolation material sandwiched between and bonded to said first and second substrates; wherein said isolation material comprises an energy absorbing thermoplastic alloy having a high material loss factor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A loudspeaker having a constrained layer damped enclosure, comprising:
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a baffle board and a plurality of transducers mounted to said baffle board; a plurality of walls connected to said baffle board which together with said baffle board define an enclosure; said baffle board comprising a constrained layer damping arrangement having a first substrate, a second substrate, and a first layer of isolation material sandwiched between and bonded to said first and second substrates, said first layer of isolation material comprising an energy absorbing thermoplastic alloy having a high material loss factor and a thickness in the range of 3.2 mm to 6.4 mm; said plurality of walls each comprises an interior substrate, an exterior substrate, and a second layer of isolation material sandwiched between and bonded to said interior and exterior substrates, said second layer of isolation material comprising an energy absorbing thermoplastic alloy having a high material loss factor; a combined thickness of the first and second substrates of the baffle board being greater than a combined thickness of the interior and exterior substrates of said plurality of walls; and further comprising a first layer of extensional damping material bonded to said first substrate on an interior side of said baffle board, and a second layer of extensional damping material bonded to said interior substrate on an interior side of each of said plurality of walls.
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Specification