SICA 18 PF 4

Subwoofer

18″ / 462 mm
Nominal diameter
38 Hz
Resonance
0.43
Q factor
94 dB
Sensitivity
± 8 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
93.7
dB
Frequency response
35 - 700
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
38.0
Hz
Mechanical quality factor
QMS
6.46
Electrical quality factor
QES
0.47
Total quality factor
QTS
0.43

Large signal parameters

Maximum linear excursion
xmax
8.0
mm
Air volume displaced at xmax
VD
931
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
1.85
mH
Winding height
HVC
27
mm
Winding material
Copper
Former material
Glass Fiber

Magnet

Flux density
B
1.05
T
Force factor
Bl
24.6
N/A
Motor constant
Bl/√RE
10.8
N/√W
Air gap height
HAG
12
mm
Weight
3.3
kg
Material
Ferrite

Diaphragm

Effective diameter
385
mm
Effective area
SD
1164
cm²
Moving mass
MMS
229.2
g
Moving mass (without air load)
MMD
201
g
Material
Paper with Total Waterproof Treatment

Suspensions

Stiffness
KMS
13.16
N/mm
Compliance
CMS
76
µm/N
Equivalent volume to the compliance
VAS
147
L
Mechanical resistance
RMS
8.47
N·s/m
Surround material
Treated Cloth

Dimensions

Nominal diameter
18
462
mm
Overall diameter
462
mm
Baffle cutout diameter
417
mm
Overall depth
210
mm
Volume occupied by the driver (estimated)
7.2
L
Net weight
13.0
kg
Frame material
Aluminium Die-Cast
SICA 18 PF 4 SPL & Impedance
SICA 18 PF 4 Dimensions

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