Specifications
Nominal diameter 530 mm (21.0 in)
Nominal impedance 4 Ω
Minimum impedance 4.2 Ω
Nominal power handling1 1700 W
Continuous power
handling2 3400 W
Sensitivity (1W/1m)3 97.0 dB
Frequency range 33 - 1000 Hz
Voice coil diameter 116 mm (4.5 in)
Winding material Copper
Former material Glass Fibre
Winding depth 34 mm (1.34 in)
Magnetic gap depth 14 mm (0.55 in)
Flux density 1.15 T
Design
Surround shape Triple Roll
Cone shape Radial
Magnet material Neodymium Inside
Slug
Spider Double Silicone
Pole design T-Pole
Woofer cone
treatment
TWP Waterproof Both
Sides
Recommended
enclosure 250.0 dm3 (8.83 ft3)
Recommended tuning 32 Hz
Parameters
Fs 33 Hz
Re 3 Ω
Qes 0.37
Qms 7.7
Qts 0.36
Vas 278.0 dm3 (9.7 ft3)
Sd 1680.0 cm2 (260.4 in2)
η₀ 2.6 %
Xmax 14.0 mm
Xvar 15.0 mm
Mms 335 g
Bl 24.8 Txm
Le 1.7 mH
EBP 89 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 250 mm (9.9 in)
Flange and gasket
thickness 14 mm (0.53 in)
Air volume occupied
by driver 15.0 dm3 (0.53 ft3)
Net weight 14.0 kg (30.8 lb)
Shipping units 1
Shipping weight 16.4 kg (36.1 lb)
Shipping box 590x590x300 mm
(23.1x23.1x11.8 in)
Service Kit
Replacement
diaphragm RCK21SW1154
