DB Drive Speed SPF12D4
Subwoofer
12″ / 304 mm
Nominal diameter
23 Hz
Resonance
0.53
Q factor
86 dB
Sensitivity
1000 W
Program Power
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Sensitivity (1W, 1m, infinite baffle)
SPL1W
85.7
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
23.2
Hz
Mechanical quality factor
QMS
5.80
Electrical quality factor
QES
0.58
Total quality factor
QTS
0.53
Large signal parameters
Power handling
P
300
W
Program power
Pmax
1000
W
Voice Coil
Nominal impedance
Z
2 x 4
Ω
DC resistance (in series)
RE
7.2
Ω
Inductance (1kHz, in series, estimated)
LE
2.33
mH
VC Diameter
64
mm
Former material
Aluminum
Magnet
Force factor (in series)
Bl
17.74
N/A
Motor constant
Bl/√RE
6.61
N/√W
Material
Ferrite
Diaphragm
Effective diameter
265
mm
Effective area
SD
552
cm²
Moving mass
MMS
174.4
g
Moving mass (without air load)
MMD
165.3
g
Suspensions
Stiffness
KMS
3.7
N/mm
Compliance
CMS
270
µm/N
Equivalent volume to the compliance
VAS
117
L
Mechanical resistance
RMS
4.38
N·s/m
Surround material
Foam
Dimensions
Nominal diameter
12
″
304
mm
Overall diameter
315
mm
Baffle cutout diameter
284
mm
Mounting depth
89
mm
Volume occupied by the driver (estimated)
2.6
L
Frame material
Steel
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fS
24 Hz
SD
471 cm²
10 - 900 Hz
QTS
0.54
xmax
12.5 mm
SPL1W
85 dB
Bl/√RE
5.75
Pmax
2000 W
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12″Subwoofer
fS
26 Hz
SD
448 cm²
10 - 900 Hz
QTS
0.57
xmax
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SPL1W
85 dB
Bl/√RE
5.6
Pmax
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JL Audio 13W7AE-D1.52 x 2 Ω
13.5″Subwoofer
fS
24 Hz
SD
693 cm²
QTS
0.45
xmax
32.0 mm
SPL1W
87 dB
Bl/√RE
9.66
Pmax
3000 W