DB Drive Speed SPF10D4
Subwoofer
10″ / 254 mm
Nominal diameter
27 Hz
Resonance
0.74
Q factor
83 dB
Sensitivity
1000 W
Program Power
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Sensitivity (1W, 1m, infinite baffle)
SPL1W
82.6
dB
Thiele & Small parameters
Resonance frequency (free air)
fS
27.4
Hz
Mechanical quality factor
QMS
7.76
Electrical quality factor
QES
0.86
Total quality factor
QTS
0.74
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
7.3
Ω
Inductance (1kHz, in series, estimated)
LE
1.92
mH
VC Diameter
64
mm
Former material
Aluminum
Magnet
Force factor (in series)
Bl
13.46
N/A
Motor constant
Bl/√RE
4.98
N/√W
Material
Ferrite
Diaphragm
Effective diameter
210
mm
Effective area
SD
346
cm²
Moving mass
MMS
124.4
g
Moving mass (without air load)
MMD
119.6
g
Suspensions
Stiffness
KMS
3.69
N/mm
Compliance
CMS
271
µm/N
Equivalent volume to the compliance
VAS
46.1
L
Mechanical resistance
RMS
2.76
N·s/m
Surround material
Foam
Dimensions
Nominal diameter
10
″
254
mm
Overall diameter
265
mm
Baffle cutout diameter
230
mm
Mounting depth
89
mm
Volume occupied by the driver (estimated)
1.7
L
Frame material
Steel
Similar subwoofers to DB Drive SPF10D4
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12″Subwoofer
fS
27 Hz
SD
480 cm²
QTS
0.65
xmax
34.0 mm
SPL1W
84 dB
Bl/√RE
7.9
Pmax
1200 W
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12″Subwoofer
fS
27 Hz
SD
480 cm²
QTS
0.65
xmax
34.0 mm
SPL1W
83 dB
Bl/√RE
7.91
Pmax
1200 W
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