Patent ID: 7508953
Filing Date: 2009-03-24
Classification: H04R

Abstract:
1. A loudspeaker comprising a driver, said driver comprising: a) at least one sound radiating element; b) at least first and second motor elements, said first and second motor elements, in operation, cooperate to move said at least one sound radiating element in response to an applied signal; and c) mounting elements coupled to said at least one sound radiating element and said first and second motor elements; wherein said first motor element is mechanically coupled to said at least one sound radiating element; wherein said driver comprises at least first and second mechanical masses which, in operation, move at different velocities in response to said applied signal; wherein said first mechanical mass comprises the mass of said at least one sound radiating element; and wherein said first and second mechanical masses are mechanically coupled such that in operation, said driver has at least fourth order frequency characteristics; wherein said mounting elements comprise at least one mechanical lever, each of said at least one mechanical lever providing at least first and second coupling points; wherein said first motor element is mechanically coupled to said at least one sound radiating element by said at least one mechanical lever, said first motor element being coupled to each of said at least one mechanical lever at one of said respective coupling points thereon, and said at least one sound radiating element being coupled to each of said at least one said mechanical lever at another of said respective coupling points thereon; wherein said second motor element is moveable in response to said applied signal during operation of said loudspeaker, and said first motor element is moveable relative to said at least one sound radiating element in response to said applied signal during operation of said loudspeaker; wherein said second motor element is coupled to each of said at least one mechanical lever at a respective third coupling point thereon, said second mechanical mass comprising the mass of said second motor element.