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
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
Apply
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
SICA 21 S 4 PL SPL & Impedance
SICA 21 S 4 PL Dimensions

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