21″ / 530 mm
Nominal diameter
33 Hz
Resonance
0.36
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
3400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.1
dB
Frequency response
33 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
33.0
Hz
Mechanical quality factor
QMS
7.70
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.36
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
4
Ω
DC resistance
RE
3.6
Ω
Inductance (1kHz)
LE
1.7
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
24.8
N/A
Motor constant
Bl/√RE
13.1
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
335
g
Moving mass (without air load)
MMD
286.8
g
Material
Waterproof Both Sides
Suspensions
Stiffness
KMS
13.16
N/mm
Compliance
CMS
76
µm/N
Equivalent volume to the compliance
VAS
278
L
Mechanical resistance
RMS
9.02
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
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Export this driver to a simulation software:
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SpeakerbenchSimilar subwoofers to B&C Speaker 21SW115
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21″Subwoofer
fS
30 Hz
SD
1680 cm²
30 - 1000 Hz
QTS
0.37
xmax
14.0 mm
SPL1W
95 dB
Bl/√RE
13
Pmax
3400 W
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18″Subwoofer
fS
32 Hz
SD
1230 cm²
50 - 2000 Hz
QTS
0.36
xmax
8.7 mm
SPL1W
96 dB
Bl/√RE
9.21
Pmax
1200 W
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18″Subwoofer
fS
31 Hz
SD
1159 cm²
36 - 800 Hz
QTS
0.34
xmax
8.1 mm
SPL1W
96 dB
Bl/√RE
9.1
Pmax
2400 W