18″ / 470 mm
Nominal diameter
25 Hz
Resonance
0.55
Q factor
88 dB
Sensitivity
± 33 mm
Linear excursion
7000 W
Program Power
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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
3500
W
Program power
Pmax
7000
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
311
mm
Volume occupied by the driver
7.36
L
Export this driver to a simulation software:
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
SpeakerbenchSimilar subwoofers to Fi Car Audio SP418 v2.1 D1
.png.webp)
Fi Car Audio BTL4 18 D22 x 2 Ω
18″Subwoofer
fS
25 Hz
SD
1210 cm²
QTS
0.52
xmax
33.0 mm
SPL1W
88 dB
Bl/√RE
12
Pmax
7000 W
.png.webp)
Fi Car Audio BTL4 18 D12 x 1 Ω
18″Subwoofer
fS
25 Hz
SD
1210 cm²
QTS
0.53
xmax
33.0 mm
SPL1W
88 dB
Bl/√RE
12
Pmax
7000 W
.png.webp)
Fi Car Audio SP418 v2.1 D22 x 2 Ω
18″Subwoofer
fS
25 Hz
SD
1210 cm²
QTS
0.55
xmax
33.0 mm
SPL1W
88 dB
Bl/√RE
12
Pmax
7000 W