Fi Car Audio SP4 12 D1

2x1Ω
2x2Ω

Subwoofer

12″ / 318 mm
Nominal diameter
28 Hz
Resonance
0.44
Q factor
83 dB
Sensitivity
± 33 mm
Linear excursion
6000 W
Program Power
Discontinued
Fi Car Audio SP4 12 D1 SubwooferFi Car Audio SP4 12 D1 SubwooferFi Car Audio SP4 12 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
83.4
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
27.9
Hz
Mechanical quality factor
QMS
6.08
Electrical quality factor
QES
0.47
Total quality factor
QTS
0.44

Large signal parameters

Maximum linear excursion
xmax
33.0
mm
Air volume displaced at xmax
VD
1584
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
0.69
mH

Magnet

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

Diaphragm

Effective diameter
247
mm
Effective area
SD
480
cm²
Moving mass
MMS
386
g
Moving mass (without air load)
MMD
378.1
g

Suspensions

Stiffness
KMS
11.83
N/mm
Compliance
CMS
85
µm/N
Equivalent volume to the compliance
VAS
27.4
L
Mechanical resistance
RMS
11.13
N·s/m

Dimensions

Nominal diameter
12
″
318
mm
Overall diameter
318
mm
Baffle cutout diameter
283
mm
Mounting depth
286
mm
Volume occupied by the driver
5.38
L
Impedance
Step response
Tone Burst

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