15″ / 397 mm
Nominal diameter
28 Hz
Resonance
0.48
Q factor
87 dB
Sensitivity
± 33 mm
Linear excursion
6000 W
Program Power
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
Sensitivity (1W, 1m, infinite baffle)
SPL1W
86.9
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
27.6
Hz
Mechanical quality factor
QMS
6.56
Electrical quality factor
QES
0.52
Total quality factor
QTS
0.48
Large signal parameters
Maximum linear excursion
xmax
33.0
mm
Air volume displaced at xmax
VD
2673
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
0.74
mH
Magnet
Force factor (in series)
Bl
13.7
N/A
Motor constant
Bl/√RE
12.0
N/√W
Diaphragm
Effective diameter
321
mm
Effective area
SD
810
cm²
Moving mass
MMS
434
g
Moving mass (without air load)
MMD
417.2
g
Suspensions
Stiffness
KMS
12.99
N/mm
Compliance
CMS
77
µm/N
Equivalent volume to the compliance
VAS
70.4
L
Mechanical resistance
RMS
11.47
N·s/m
Dimensions
Nominal diameter
15
″
397
mm
Overall diameter
397
mm
Baffle cutout diameter
359
mm
Mounting depth
286
mm
Volume occupied by the driver
5.95
L
Similar subwoofers to Fi Car Audio SP4 15 D1
15″Subwoofer
fS
28 Hz
SD
810 cm²
QTS
0.48
xmax
33.0 mm
SPL1W
87 dB
Bl/√RE
12
Pmax
7000 W
15″Subwoofer
fS
27 Hz
SD
810 cm²
QTS
0.46
xmax
33.0 mm
SPL1W
87 dB
Bl/√RE
12
Pmax
7000 W
15″Subwoofer
fS
27 Hz
SD
810 cm²
QTS
0.46
xmax
33.0 mm
SPL1W
87 dB
Bl/√RE
12
Pmax
7000 W