Fi Car Audio IB318 v2 S4

2Ω
4Ω

Subwoofer

18″ / 470 mm
Nominal diameter
24 Hz
Resonance
0.79
Q factor
89 dB
Sensitivity
± 34 mm
Linear excursion
1200 W
Program Power
Fi Car Audio IB318 v2 S4 SubwooferFi Car Audio IB318 v2 S4 SubwooferFi Car Audio IB318 v2 S4 Subwoofer
Excursion
Velocity
SPL
Phase
Group delay
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
88.7
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
24.4
Hz
Mechanical quality factor
QMS
9.56
Electrical quality factor
QES
0.87
Total quality factor
QTS
0.79

Large signal parameters

Maximum linear excursion
xmax
34.0
mm
Air volume displaced at xmax
VD
4114
cm³
Power handling
P
600
W
Program power
Pmax
1200
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.6
Ω
Inductance (1kHz, estimated)
LE
1.75
mH

Magnet

Force factor
Bl
15.0
N/A
Motor constant
Bl/√RE
7.91
N/√W

Diaphragm

Effective diameter
393
mm
Effective area
SD
1210
cm²
Moving mass
MMS
338
g
Moving mass (without air load)
MMD
308.2
g

Suspensions

Stiffness
KMS
8.33
N/mm
Compliance
CMS
120
µm/N
Equivalent volume to the compliance
VAS
246
L
Mechanical resistance
RMS
5.42
N·s/m

Dimensions

Nominal diameter
18
″
470
mm
Overall diameter
470
mm
Baffle cutout diameter
425
mm
Mounting depth
241
mm
Volume occupied by the driver
6.23
L
Impedance
Step response
Tone Burst

Export this driver to a simulation software:

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