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
Focal 30 A4 SubwooferFocal 30 A4 Subwoofer
Excursion
Velocity
SPL
Phase
Group delay
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
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
Impedance
Step response
Tone Burst
Focal 30 A4 Dimensions
DatasheetDatasheet

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