Focal ACCESS 30 A4
Subwoofer
12″ / 300 mm
Nominal diameter
25 Hz
Resonance
0.67
Q factor
85 dB
Sensitivity
± 8.5 mm
Linear excursion
500 W
Program Power
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Sensitivity (1W, 1m, infinite baffle)
SPL1W
84.6
dB
Frequency response
32 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
24.7
Hz
Mechanical quality factor
QMS
5.49
Electrical quality factor
QES
0.76
Total quality factor
QTS
0.67
Large signal parameters
Maximum linear excursion
xmax
8.5
mm
Air volume displaced at xmax
VD
434
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
4.0
Ω
Inductance (1kHz)
LE
2.85
mH
VC Diameter
50
mm
Winding height
HVC
25
mm
Winding material
Copper
Former material
Kapton
Magnet
Flux density
B
0.8
T
Force factor
Bl
11.94
N/A
Motor constant
Bl/√RE
5.96
N/√W
Air gap height
HAG
8
mm
Diameter
120
mm
Height
30
mm
Weight
1.25
kg
Diaphragm
Effective diameter
255
mm
Effective area
SD
511
cm²
Moving mass
MMS
175
g
Moving mass (without air load)
MMD
166.6
g
Material
Dual Fiberglass Structure
Suspensions
Stiffness
KMS
4.22
N/mm
Compliance
CMS
237
µm/N
Equivalent volume to the compliance
VAS
86.9
L
Mechanical resistance
RMS
4.947
N·s/m
Surround material
Butyl
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
315
mm
Baffle cutout diameter
273
mm
Mounting depth
147
mm
Volume occupied by the driver (estimated)
1.6
L
Net weight
3.7
kg
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SD
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SD
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SD
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