B&C Speakers 21SW152 21-inch Subwoofer Woofer Cone TWP Waterproof Both Sides 2000 Wrms 4000 Watts Peak Audio Speaker Ventilated 6-in Voice Coil Gap 8 Ohm — Open-Box, 13% Off

FEATURES : This advanced speaker driver offers 4000 watts of continuous power and a 6-inch split winding copper voice coil for efficient low-frequency performance from 30 to 1000 Hz. With 96 dB sensitivity and a neodymium magnet, it delivers powerful, linear output. Its double silicone spider ensures stability, while a ventilated voice coil gap reduces power compression and an aluminum demodulating ring minimizes distortion for clear, accurate sound.

SPECIFICATIONS : This 21-inch speaker driver is engineered for robust low-frequency output, handling up to 4000 W continuously with an 8-ohm impedance and 96 dB sensitivity. It features a 6-inch copper voice coil wound on a glass fibre former, operating across a 30–1000 Hz range. With a 1.2 Tesla flux density and waterproof-treated cone on both sides, it offers high durability and reliable performance in demanding conditions.

PARAMETERS : This speaker driver is optimized for deep bass performance, featuring a 32 Hz resonance frequency, a large 1680 cm² piston area, and a 15 mm peak excursion. With a 450 g moving mass, 6-ohm resistance, and 2.2 mH inductance, it delivers efficient and controlled output. Its Qts of 0.36 and EBP of 84 Hz make it versatile for sealed or vented enclosures, while a 200 dm³ compliance volume, 39 Tm motor strength, and 1.9% efficiency ensure dynamic and powerful sound reproduction.

DESIGN : This speaker driver features a triple roll surround and a radial cone shape, supported by a double silicone spider for enhanced stability and control. It utilizes a neodymium inside slug magnet with a T-pole design to ensure strong magnetic performance. The woofer cone is treated with TWP waterproofing on both sides for durability in demanding conditions. Optimized for deep bass output, it performs best in a 190 dm³ (6.71 ft³) enclosure tuned to 33 Hz.

MOUNTING AND SHIPPING INFO : This speaker driver has a robust physical profile, featuring an overall diameter of 21.54 inches and a depth of 10.28 inches. It requires a baffle cutout diameter of 20 inches and mounts using a 20.75-inch bolt circle. The flange and gasket thickness is 0.63 inches, and the unit occupies 0.57 cubic feet (16 dm³) of internal air volume. It weighs 40.79 pounds and ships in a box measuring 2.44 × 22.44 × 12.60 inches, with a total shipping weight of 45.86 pounds.