Fi Car Audio SP4 18 D1

2x1Ω
2x2Ω

Subwoofer

18″ / 470 mm
Nominal diameter
25 Hz
Resonance
0.55
Q factor
88 dB
Sensitivity
± 33 mm
Linear excursion
6000 W
Program Power
Discontinued
Fi Car Audio SP4 18 D1 SubwooferFi Car Audio SP4 18 D1 SubwooferFi Car Audio SP4 18 D1 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
88.4
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
24.7
Hz
Mechanical quality factor
QMS
7.45
Electrical quality factor
QES
0.60
Total quality factor
QTS
0.55

Large signal parameters

Maximum linear excursion
xmax
33.0
mm
Air volume displaced at xmax
VD
3993
cm³
Power handling
P
3000
W
Program power
Pmax
6000
W

Voice Coil

Nominal impedance
Z
2 x 1
Ω
DC resistance (in series)
RE
1.3
Ω
Inductance (1kHz, in series, estimated)
LE
0.86
mH

Magnet

Force factor (in series)
Bl
13.7
N/A
Motor constant
Bl/√RE
12.0
N/√W

Diaphragm

Effective diameter
393
mm
Effective area
SD
1210
cm²
Moving mass
MMS
555
g
Moving mass (without air load)
MMD
525.2
g

Suspensions

Stiffness
KMS
13.51
N/mm
Compliance
CMS
74
µm/N
Equivalent volume to the compliance
VAS
154
L
Mechanical resistance
RMS
11.56
N·s/m

Dimensions

Nominal diameter
18
″
470
mm
Overall diameter
470
mm
Baffle cutout diameter
425
mm
Mounting depth
286
mm
Volume occupied by the driver
7.36
L
Impedance
Step response
Tone Burst

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