Rockford Fosgate P2D4-12

2x2Ω
2x4Ω

Subwoofer

12″ / 305 mm
Nominal diameter
27 Hz
Resonance
0.54
Q factor
87 dB
Sensitivity
± 13.3 mm
Linear excursion
800 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
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Specifications

Sensitivity (1w, 1m, infinite baffle)
SPL1W
86.6
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
27.2
Hz
Mechanical quality factor
QMS
6.30
Electrical quality factor
QES
0.59
Total quality factor
QTS
0.54

Large signal parameters

Maximum linear excursion
xmax
13.3
mm
Air volume displaced at xmax
VD
758
cm³
Power handling
P
400
W
Program power
Pmax
800
W

Voice Coil

Nominal impedance
Z
2 x 4
Ω
DC resistance (in series)
RE
6.4
Ω
Inductance (1kHz, in series)
LE
5.5
mH
VC Diameter
57
mm

Magnet

Force factor (in series)
Bl
18.9
N/A
Motor constant
Bl/√RE
7.47
N/√W
Weight
2.06
kg

Diaphragm

Effective diameter
269
mm
Effective area
SD
570
cm²
Moving mass
MMS
193.4
g
Moving mass (without air load)
MMD
184.3
g

Suspensions

Stiffness
KMS
5.65
N/mm
Compliance
CMS
177
µm/N
Equivalent volume to the compliance
VAS
81.5
L
Mechanical resistance
RMS
5.25
N·s/m

Dimensions

Nominal diameter
12
305
mm
Baffle cutout diameter
285
mm
Mounting depth
162
mm
Volume occupied by the driver
2.41
L

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