Importance

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Abstract

A subwoofer cabinet having a volume less that 1 ft.sup.3 axially aligned openings in opposed cabinet walls; first and second cages mounted on respective ones of the walls in alignment with the openings; a voice coil driven driver including an annular 225 oz. magnet affixed to the first cage; a stationary pole piece extending through the magnet and defining a magnetic gap therebetween; a voice coil mounted on a cylindrical voice coil former positioned within the gap; a cone affixed to one end of the former; a first flexible surround secured to the outer end of the cone and attached at its periphery to the first cage; a flexible spider secured to the former and at its outer periphery to the first cage; a mass driven driver including a 1.7 lb. mass; a second flexible surround secured to the mass and to the second cage; a flexible spider attached to the second cage and to the mass; both surrounds having a uniform thickness of at least 0.1', an edgeroll having a diameter of at least 1.5', and capable of standing off internal pressures of 1.5 lbs./in.sup.2 to 3 lbs./in.sup.2 ; a drive amplifier capable of delivering 2,700 watts to a nominal 4 ohm resistive load and swinging 104 volts for delivering (+)-v and (-)-v drive signals to the voice coil for driving the voice coil driven driver through a peak-to-peak stroke of about 2.5' while generating a large back emf sufficient to counter the applied emf and minimize current flow in the voice coil.

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First Claim