B&C 21DS115 - 4ohm

Specifications

Nominal Diameter

530 mm (21.0 in)

Nominal Impedance

8 Ω

Minimum Impedance

6.5 Ω

Nominal Power Handling1

1700 W

Continuous power handling2

3400 W

Sensitivity (1W/1m)3

99.0 dB

Frequency Range

30 - 1000 Hz

Voice Coil Diameter

116 mm (4.5 in)

Winding Material

Aluminium

Former Material

Glass Fibre

Winding Depth

36.0 mm (1.42 in)

Magnetic Gap Depth

14.0 mm (0.55 in)

Flux Density

0.8 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

130.0 dm3 (4.59 ft3)

Recommended Tuning

40 Hz

Parameters4

Resonance Frequency

30 Hz

Re

5.1 Ω

Qes

0.24

Qms

10.0

Qts

0.23

Vas

269.0 dm3 (9.5 ft3)

Sd

1680.0 cm2 (260.4 in2)

η₀

3.0 %

Xmax

± 15.0 mm

Xvar

± 16.5 mm

Mms

407.0 g

Bl

40.8 Txm

Le

4.6 mH

EBP

125 Hz

Mounting and Shipping Info

Overall Diameter

547 mm (21.54 in)

Bolt Circle Diameter

527 mm (20.7 in)

Baffle Cutout Diameter

508.0 mm (20.0 in)

Depth

255 mm (10.04 in)

Flange and Gasket Thickness

13 mm (0.51 in)

Air Volume Occupied by Driver

15.0 dm3 (0.53 ft3)

Net Weight

14.8 kg (32.63 lb)

Shipping Units

1

Shipping Weight

17.1 kg (37.7 lb)