SICA 21 S 4 PL
Subwoofer
21″ / 545 mm
Nominal diameter
35 Hz
Resonance
0.3
Q factor
97 dB
Sensitivity
± 5.2 mm
Linear excursion
2400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.6
dB
Frequency response
35 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
34.6
Hz
Mechanical quality factor
QMS
9.95
Electrical quality factor
QES
0.31
Total quality factor
QTS
0.30
Large signal parameters
Maximum linear excursion
xmax
5.2
mm
Air volume displaced at xmax
VD
864
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.7
Ω
Inductance (1kHz)
LE
1.6
mH
VC Diameter
100
mm
Winding height
HVC
17
mm
Winding material
Copper
Former material
Glass Fiber
Magnet
Flux density
B
0.89
T
Force factor
Bl
36.1
N/A
Motor constant
Bl/√RE
15.1
N/√W
Weight
0.536
kg
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
325
g
Moving mass (without air load)
MMD
277.5
g
Material
Paper
Suspensions
Stiffness
KMS
15.39
N/mm
Compliance
CMS
65
µm/N
Equivalent volume to the compliance
VAS
255
L
Mechanical resistance
RMS
7.1
N·s/m
Surround material
Treated Cloth
Dimensions
Nominal diameter
21
″
545
mm
Overall diameter
545
mm
Baffle cutout diameter
497
mm
Overall depth
249
mm
Volume occupied by the driver (estimated)
7.8
L
Net weight
10.5
kg
Frame material
Aluminium Die-Cast
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SD
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SD
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