Fi Car Audio BL18v3 D2

2x1Ω
2x2Ω

Subwoofer

18″ / 470 mm
Nominal diameter
34 Hz
Resonance
0.4
Q factor
93 dB
Sensitivity
± 20 mm
Linear excursion
3500 W
Program Power
Discontinued
Fi Car Audio BL18v3 D2 SubwooferFi Car Audio BL18v3 D2 SubwooferFi Car Audio BL18v3 D2 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
92.6
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
33.6
Hz
Mechanical quality factor
QMS
8.21
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.40

Large signal parameters

Maximum linear excursion
xmax
20.0
mm
Air volume displaced at xmax
VD
2420
cm³
Power handling
P
1750
W
Program power
Pmax
3500
W

Voice Coil

Nominal impedance
Z
2 x 2
Ω
DC resistance (in series)
RE
2.8
Ω
Inductance (1kHz, in series, estimated)
LE
1.36
mH

Magnet

Force factor (in series)
Bl
21.9
N/A
Motor constant
Bl/√RE
13.1
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
14.31
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
136
L
Mechanical resistance
RMS
8.69
N·s/m

Dimensions

Nominal diameter
18
″
470
mm
Overall diameter
470
mm
Baffle cutout diameter
425
mm
Mounting depth
248
mm
Volume occupied by the driver
7.36
L
Impedance
Step response
Tone Burst

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