DB Drive Speed SPF12D4

Subwoofer

12″ / 304 mm
Nominal diameter
23 Hz
Resonance
0.53
Q factor
86 dB
Sensitivity
1000 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
Discard
Apply
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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