Features
3000 W continuous program power capacity
150 mm (6 in) copper voice coil
30 - 1000 Hz response
95 dB sensitivity
Ventilated voice coil and aluminium demodulating ring
60 mm peak-to-peak excursion before damage
Double silicone spider with optimized compliance
The next generation 21' subwoofer from B&C features a massive neodymium ring magnet
coupled with a 150 mm (6') split winding voice coil, that safely allows over 60
mm (2.5') of controlled peak-to-peak excursion. The newly engineered, ventilated
chassis and double silicone spider keep things safe and cool
Specifications
Nominal Diameter
530 mm (21 in)
Nominal Impedance
4 Ω
Minimum Impedance
4 Ω
Nominal Power Handling
1500 W
Continuous Power Handling
3000 W
Sensitivity
95 dB
Frequency Range
30 - 1000 Hz
Voice Coil Diameter
150 mm (6 in)
Winding Material
Copper
Former Material
Glass Fibre
Winding Depth
30 mm (1.18 in)
Magnetic Gap Depth
12 mm (0.5 in)
Flux Density
1.2 T
Woofer Cone Treatment
TWP Waterproof Both Sides
Parameters
Fs
29 Hz
Re
3 Ω
Qes
0.27
Qms
8.1
Qts
0.26
Vas
254 dm³ (8.9 ft³)
Sd
1680 cm² (260.4 sq²)
η0
2 %
Xmax
15 mm
Xvar
16 mm
Mms
494 g
Bl
32.6 Tm
Le
1.3 mH
EBP
107 Hz
Design
Surround Shape
Triple Roll
Cone Shape
Radial
Magnet Material
Neodymium Ring
Spider
Double Silicone
Pole Design
T-Pole
Woofer Cone Treatment
TWP Waterproof Both Sides
Recommended Enclosure
190 dm³ (6.71 ft³)
Recommended Tuning
33 Hz
Mounting and Shipping Info
Overall Diameter
547 mm (21.5 in)
Bolt Circle Diameter
527 mm (20.7 in)
Baffle Cutout Diameter
508 mm (20 in)
Depth
250 mm (8.2 in)
Flange and Gasket Thickness
16 mm (0.62 in)
Net Weight
18 kg (40 lb)
Shipping Units
1 pcs
Shipping Weight
20.3 kg (44.75 lb)
Shipping Box
570x570x320 mm (22.44x22.44x12.60 in)
Service Kit
lf Recone Kit
RCK21SW1504
Cone
Basket
Centering Shims