Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Patent
1999-07-26
2000-10-10
Woo, Stella
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
381400, H04R 2500
Patent
active
061309540
ABSTRACT:
A small, compact subwoofer cabinet; openings in two 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 magnet weighing approximately 225 oz 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 to the first cage; a flexible spider secured to the former and to the first cage; a mass driven driver including a mass aggregating about 2 lbs; 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 thickness of about 0.1", an edgeroll having a diameter of about 1.5", and capable of standing off internal pressures of up to about 3 lbs/in.sup.2 ; a drive amplifier capable of delivering up to about 2,700 watts to a nominal 4 ohm resistive load and swinging up to about 104 volts for delivering (+).DELTA.v and (-).DELTA.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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Dabney P.
Woo Stella
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