SB Acoustics SB20PFC30-4

4Ω
8Ω

Woofer

8″ / 203 mm
Nominal diameter
34 Hz
Resonance
0.33
Q factor
90 dB
Sensitivity
± 5.75 mm
Linear excursion
100 W
Program Power
SB Acoustics SB20PFC30-4 WooferSB Acoustics SB20PFC30-4 Woofer
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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
89.7
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
33.7
Hz
Mechanical quality factor
QMS
2.78
Electrical quality factor
QES
0.37
Total quality factor
QTS
0.33

Large signal parameters

Maximum linear excursion
xmax
5.75
mm
Air volume displaced at xmax
VD
124
cm³
Power handling
P
50
W
Program power
Pmax
100
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.4
Ω
Inductance (1kHz)
LE
0.71
mH
VC Diameter
31
mm
Winding height
HVC
16.5
mm

Magnet

Flux density
B
1.2
T
Force factor
Bl
6.6
N/A
Motor constant
Bl/√RE
3.58
N/√W
Air gap height
HAG
5
mm
Weight
0.54
kg

Diaphragm

Effective diameter
166
mm
Effective area
SD
216
cm²
Moving mass
MMS
22.4
g
Moving mass (without air load)
MMD
20.1
g

Suspensions

Stiffness
KMS
1.0
N/mm
Compliance
CMS
1000
µm/N
Equivalent volume to the compliance
VAS
66.2
L
Mechanical resistance
RMS
1.7
N·s/m

Dimensions

Nominal diameter
8
″
203
mm
Volume occupied by the driver (estimated)
0.58
L
Net weight
1.43
kg
SPL & Impedance
SB Acoustics SB20PFC30-4 SPL & Impedance
SB Acoustics SB20PFC30-4 Dimensions
DatasheetDatasheet

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