Fi Car Audio IB315 v2 S4

Subwoofer

15″ / 397 mm
Nominal diameter
26 Hz
Resonance
0.76
Q factor
86 dB
Sensitivity
± 34 mm
Linear excursion
1200 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
86.4
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
26.1
Hz
Mechanical quality factor
QMS
8.73
Electrical quality factor
QES
0.83
Total quality factor
QTS
0.76

Large signal parameters

Maximum linear excursion
xmax
34.0
mm
Air volume displaced at xmax
VD
2754
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
1.62
mH

Magnet

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

Diaphragm

Effective diameter
321
mm
Effective area
SD
810
cm²
Moving mass
MMS
298
g
Moving mass (without air load)
MMD
281.2
g

Suspensions

Stiffness
KMS
7.87
N/mm
Compliance
CMS
127
µm/N
Equivalent volume to the compliance
VAS
115
L
Mechanical resistance
RMS
5.6
N·s/m

Dimensions

Nominal diameter
15
397
mm
Overall diameter
397
mm
Baffle cutout diameter
359
mm
Mounting depth
203
mm
Volume occupied by the driver
4.81
L

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