B&C Speaker 21SW115

Subwoofer

21″ / 530 mm
Nominal diameter
30 Hz
Resonance
0.37
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3400 W
Program Power
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
94.9
dB
Frequency response
30 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
10.90
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.37

Large signal parameters

Maximum linear excursion
xmax
14.0
mm
Air volume displaced at xmax
VD
2352
cm³
Power handling
P
1700
W
Program power
Pmax
3400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
2.1
mH
VC Diameter
116
mm
Winding height
HVC
34
mm
Winding material
Copper
Former material
Glass Fibre

Magnet

Flux density
B
1.15
T
Force factor
Bl
30.1
N/A
Motor constant
Bl/√RE
13.0
N/√W
Air gap height
HAG
14
mm
Material
Neodymium Inside Slug

Diaphragm

Effective diameter
462
mm
Effective area
SD
1680
cm²
Moving mass
MMS
342
g
Moving mass (without air load)
MMD
293.8
g
Material
Waterproof Both Sides

Suspensions

Stiffness
KMS
12.35
N/mm
Compliance
CMS
81
µm/N
Equivalent volume to the compliance
VAS
318
L
Mechanical resistance
RMS
5.91
N·s/m
Spider material
Silicone

Dimensions

Nominal diameter
21
530
mm
Overall diameter
547
mm
Baffle cutout diameter
503
mm
Overall depth
249
mm
Flange thickness
14
mm
Mounting depth
235
mm
Volume occupied by the driver
15.0
L
Net weight
14.0
kg
B&C Speaker 21SW115 Impedance
B&C Speaker 21SW115 SPL
B&C Speaker 21SW115 Dimensions

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