Skar Audio DDX-12 D4

2x2Ω
2x4Ω

Subwoofer

12″ / 319 mm
Nominal diameter
34 Hz
Resonance
0.37
Q factor
87 dB
Sensitivity
± 15 mm
Linear excursion
1500 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
87.1
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
34.2
Hz
Mechanical quality factor
QMS
3.90
Electrical quality factor
QES
0.41
Total quality factor
QTS
0.37

Large signal parameters

Maximum linear excursion
xmax
15.0
mm
Air volume displaced at xmax
VD
765
cm³
Power handling
P
1000
W
Program power
Pmax
1500
W

Voice Coil

Nominal impedance
Z
2 x 4
Ω
DC resistance (in series)
RE
8.2
Ω
Inductance (1kHz, in series, estimated)
LE
3.19
mH
VC Diameter
64
mm
Winding material
Copper

Magnet

Force factor (in series)
Bl
31.8
N/A
Motor constant
Bl/√RE
11.1
N/√W
Diameter
193
mm

Diaphragm

Effective diameter
255
mm
Effective area
SD
510
cm²
Moving mass
MMS
235
g
Moving mass (without air load)
MMD
226.5
g
Material
Pressed Paper

Suspensions

Stiffness
KMS
14.29
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
25.9
L
Mechanical resistance
RMS
12.95
N·s/m
Surround material
Foam

Dimensions

Nominal diameter
12
319
mm
Overall diameter
319
mm
Baffle cutout diameter
286
mm
Overall depth
191
mm
Flange thickness
24
mm
Mounting depth
167
mm
Volume occupied by the driver (estimated)
3.7
L

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