B&C Speakers 21SW150 User Manual

Specification

Nominal Diameter 530 (21) mm (in)
Nominal Impedance (1) 4 Ohm
Minimum Impedence 4 Ohm
Nominal Power Handling (2) 1500 W
Continuous Power Handling (3) 3000 W
Sensitivity (1W/1m) (4) 95 dB
Frequency Range 30 - 1000 Hz
Voice Coil Diameter 150 (6) mm (in)
Winding Material Copper
Former Material Glass Fibre
Winding Depth 30 (1.18) mm (in)
Magnetic Gap Depth 12 (1/2) mm (in)
Flux Density 1.2 T

Thiele & Small Parameters

Fs 29 Hz
Re 3.3 Ohm
Qes 0.27
Qms 8.1
Qts 0.26
Vas 254 (8.9) dm3 (ft3)
Sd 1680 (260.4) cm2 (in2)
Eta Zero 2 %
Xmax +/- 15 mm
Xvar +/- 16 mm
Mms 494 g
Bl 32.6 Txm
Le 1.3 mH

21SW150

Ventilated voice coil and aluminium demodulating ring

Subwoofer

3000 W continuous program power capacity

150 mm (6 in) copper voice coil

30 – 1000 Hz response

95 dB sensitivity

60 mm peak-to-peak excursion before damage

Double silicone spider with optimized compliance

LF Drivers LF Nd Drivers Coaxials HF Drivers Horns

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 15.5 mm (5/8 in)
Net Weight 18 kg (40 lb)
Shipping Weight 20.4 kg (44.9 lb)
Shipping Box 590x590x300 mm

1

For different impedances, please ask.

2

2 hours test made with continuous pink noise signal (6 dB crest factor).
Power calculated on rated minimum impedance.

3

Power on Continuous Program is defined as 3 dB greater than the
Nominal rating.

4

Applied RMS Voltage is set to 2.83V for 8 ohms or 2.0V for 4 ohms
Nominal Impedance

(23.2x23.2x11.8 in)