8″ / 200 mm
Nominal diameter
68 Hz
Resonance
0.39
Q factor
93 dB
Sensitivity
± 5.5 mm
Linear excursion
500 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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.1
dB
Frequency response
68 - 4500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
68.0
Hz
Mechanical quality factor
QMS
4.10
Electrical quality factor
QES
0.43
Total quality factor
QTS
0.39
Large signal parameters
Maximum linear excursion
xmax
5.5
mm
Air volume displaced at xmax
VD
125
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
16
Ω
DC resistance
RE
9.8
Ω
Inductance (1kHz)
LE
0.83
mH
VC Diameter
51
mm
Winding height
HVC
15
mm
Winding material
Aluminium
Former material
Glass Fibre
Magnet
Flux density
B
1.19
T
Force factor
Bl
13.73
N/A
Motor constant
Bl/√RE
4.39
N/√W
Air gap height
HAG
8
mm
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
19.7
g
Moving mass (without air load)
MMD
17.1
g
Suspensions
Stiffness
KMS
3.53
N/mm
Compliance
CMS
283
µm/N
Equivalent volume to the compliance
VAS
20.5
L
Mechanical resistance
RMS
2.05
N·s/m
Dimensions
Nominal diameter
8
″
200
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
92
mm
Flange thickness
9
mm
Mounting depth
83
mm
Volume occupied by the driver
1.1
L
Net weight
3.4
kg
Similar woofers to B&C Speaker 8FMB51
10″Mid Bass
fS
68 Hz
SD
317 cm²
65 - 3000 Hz
QTS
0.41
xmax
8.3 mm
SPL1W
93 dB
Bl/√RE
6.52
Pmax
1000 W
10″Subwoofer
fS
67 Hz
SD
347 cm²
70 - 4000 Hz
QTS
0.39
xmax
7.5 mm
SPL1W
93 dB
Bl/√RE
7.02
Pmax
1000 W
8″Mid Bass
fS
68 Hz
SD
220 cm²
65 - 4000 Hz
QTS
0.38
xmax
6.0 mm
SPL1W
94 dB
Bl/√RE
4.29
Pmax
400 W