B&C 21SW152-4 21" Professional Neodymium Subwoofer 4 Ohm
B&C's 21SW152 21" subwoofer driver features a massive 260 square inches of diaphragm surface area—nearly 40% more than an 18" driver and equal to double the Sd of a typical 15".
Key Features
- 4,000 watt continuous program power capacity
- 6" diameter, 1" long split winding copper voice coil wound on fiberglass former
- 15 mm Xmax, 60 mm peak-to-peak excursion before damage
- Neodymium ring magnet allows a very high force factor and linear excursion
- Ventilated voice coil gap for reduced power compression
- Aluminum demodulating ring decreases distortion
- Double silicone spider with optimized compliance
Your Price: $845.82
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MSRP: $1,409.70
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B&C Speakers 21SW152-4 Specifications 
California Prop 65