15″ / 387 mm
Nominal diameter
33 Hz
Resonance
0.43
Q factor
91 dB
Sensitivity
± 6 mm
Linear excursion
550 W
Program Power
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Available on (affiliate link)
Parts Express
$$$
Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
91.3
dB
Frequency response
25 - 2100
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
33.3
Hz
Mechanical quality factor
QMS
3.40
Electrical quality factor
QES
0.49
Total quality factor
QTS
0.43
Large signal parameters
Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
494
cm³
Power handling
P
275
W
Program power
Pmax
550
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.7
Ω
Inductance (1kHz)
LE
2.4
mH
VC Diameter
51
mm
Winding material
Aluminum
Magnet
Force factor
Bl
16.6
N/A
Motor constant
Bl/√RE
8.63
N/√W
Weight
2.126
kg
Diaphragm
Effective diameter
324
mm
Effective area
SD
824
cm²
Moving mass
MMS
173.3
g
Moving mass (without air load)
MMD
156.6
g
Material
Poly-Mica
Suspensions
Stiffness
KMS
7.61
N/mm
Compliance
CMS
131
µm/N
Equivalent volume to the compliance
VAS
125
L
Mechanical resistance
RMS
10.67
N·s/m
Surround material
Rubber
Dimensions
Nominal diameter
15
″
387
mm
Overall diameter
387
mm
Baffle cutout diameter
349
mm
Mounting depth
140
mm
Volume occupied by the driver (estimated)
1.0
L
Net weight
2.495
kg
Frame material
Die Cast Aluminum
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Fi Car Audio SP3 18 D22 x 2 Ω
18″Subwoofer
fS
32 Hz
SD
1210 cm²
QTS
0.41
xmax
34.0 mm
SPL1W
92 dB
Bl/√RE
14
Pmax
5000 W
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Fi Car Audio SP3 18 D12 x 1 Ω
18″Subwoofer
fS
32 Hz
SD
1210 cm²
QTS
0.41
xmax
34.0 mm
SPL1W
92 dB
Bl/√RE
14
Pmax
5000 W
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18″Subwoofer
fS
36 Hz
SD
1134 cm²
20 - 200 Hz
QTS
0.50
xmax
14.0 mm
SPL1W
91 dB
Bl/√RE
12
Pmax
2000 W