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The LT 7 is based upon technology which AMERICAN POWER AND LIGHT, INC., began to patent in the past decade of the 1980ties, and continues to patent today. The patented driver system consists of very high strength thin flat panels, constructed of an interlocked , cross-linked polyimide foam core, thermally and adhesively bonded to unidirectional carbon fibre filaments. This panel construction is intrinsically tens of times stronger than the strongest cone, and yet lighter, while fully comparable in overall strength to military aircraft wing construction. This panel construction has high internal damping, which means that the sound you hear is the sound of electron conversion to mechanical displacement, rather than the vibratile sound of the diaphragm material structure itself.
The electro- magnetic system driving this flat carbon fibre panel is an extended carbon fibre coil former completely enclosing an extended elliptical copper or silver coil, which is itself surrounded on either side by complementary , extended pole pieces coupled to state of the art high gauss ferrite, or rare earth magnets. The coil system encloses no permeable magnetic material, and thus has no measureable inductance. The overall mechanical topology is that of a flat , free piston , extended direct radiator, not a tympanically stretched film planar device, which is the ordinary, usual topology, in which the film must essentially collapse, or stretch radially, to move axially. As a free piston, capable of excursions of more that one quarter inch, peak to peak, the carbon fibre panels are not stroke limited, as are tensioned film based electrostatics, or planar magnetics, and can thus track to full extension, or excursion, fast rising pulse or transient waveforms.
The midrange/bass driver in the LT 7 measures eighteen inches by six inches, and thus has a driven surface area of one hundred eight inches, or the equivalent to the true piston area of a fifteen inch driver, while the tweeter/midrange measures eighteen inches by one and one half inches, or vastly greater than any typical tweeter array. This formidable driver array is housed within an enclosure which measures twenty four and one half inches high, by fourteen inches wide, and only two inches deep, and is thus completely suitable for on wall, or in wall mounting.
The LT 7 is an all first order, high time domain fidelity loudspeaker, which means that the drivers have intrinsically wide frequency band performance with very low phase shift, or transient distortion. A further benefit of this fully planar, free piston design is exceptional sound stage accuracy, with full dimensional recreaction of complex orchestral sound images, with the easy ability to completely, and accurately present complex electrical input waveforms, as the stuff of music itelf, the moving air in a room.
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