Specifications
Nominal diameter 530 mm (21.0 in)
Nominal impedance 4 Ω
Minimum impedance 4.2 Ω
Nominal power handling1 2000 W
Continuous power
handling2 4000 W
Sensitivity (1W/1m)3 96.0 dB
Frequency range 30 - 1000 Hz
Voice coil diameter 153 mm (6.0 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
Surround shape Triple Roll
Cone shape Radial
Magnet material Neodymium Inside
Slug
Design
Spider Double Silicone
Pole design T-Pole
Woofer cone
treatment
TWP Waterproof Both
Sides
Recommended
enclosure 190.0 dm3 (6.71 ft3)
Recommended tuning 33 Hz
Fs 32 Hz
Re 3 Ω
Qes 0.31
Qms 7.0
Qts 0.3
Vas 200.0 dm3 (7.0 ft3)
Sd 1680.0 cm2 (260.4 in2)
η₀ 2.2 %
Xmax 15.0 mm
Xvar 16.0 mm
Mms 460 g
Bl 32.5 Txm
Parameters
Le 1.5 mH
EBP 103 Hz
Mounting And Shipping Info
Overall diameter 547 mm (21.5 in)
Bolt circle diameter 527 mm (20.7 in)
Baffle cutout
diameter 508.0 mm (20.0 in)
Depth 261 mm (10.3 in)
Flange and gasket
thickness 16 mm (0.63 in)
Air volume occupied
by driver 16.0 dm3 (0.56 ft3)
Net weight 18.5 kg (40.7 lb)
Shipping units 1
Shipping weight 20.9 kg (46.0 lb)
Shipping box 590x590x300 mm
(23.2x23.2x11.8 in)
Service Kit
Replacement
diaphragm RCK21SW1524
