8″ / 200 mm
Nominal diameter
52 Hz
Resonance
0.4
Q factor
90 dB
Sensitivity
± 6.5 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
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
89.6
dB
Frequency response
50 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
52.0
Hz
Mechanical quality factor
QMS
12.30
Electrical quality factor
QES
0.42
Total quality factor
QTS
0.40
Large signal parameters
Maximum linear excursion
xmax
6.5
mm
Air volume displaced at xmax
VD
143
cm³
Power handling
P
250
W
Program power
Pmax
500
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.1
Ω
Inductance (1kHz)
LE
0.5
mH
VC Diameter
51
mm
Winding height
HVC
17
mm
Former material
Glass Fibre
Magnet
Flux density
B
1.15
T
Force factor
Bl
11.8
N/A
Motor constant
Bl/√RE
5.23
N/√W
Air gap height
HAG
8
mm
Material
Neodymium Inside Slug
Diaphragm
Effective diameter
167
mm
Effective area
SD
220
cm²
Moving mass
MMS
35
g
Moving mass (without air load)
MMD
32.5
g
Material
Waterproof Front Side
Suspensions
Stiffness
KMS
3.75
N/mm
Compliance
CMS
267
µm/N
Equivalent volume to the compliance
VAS
18
L
Mechanical resistance
RMS
0.93
N·s/m
Dimensions
Nominal diameter
8
″
200
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
90
mm
Flange thickness
11
mm
Mounting depth
79
mm
Volume occupied by the driver
1.1
L
Net weight
1.85
kg
Similar subwoofers to B&C Speaker 8BG51
6 x 9″2 Way Kit
fS
50 Hz
SD
170 cm²
50 - 22000 Hz
QTS
0.40
xmax
5.0 mm
SPL1W
89 dB
Bl/√RE
3.69
Pmax
260 W
8″Low frequency
fS
51 Hz
SD
227 cm²
50 - 6000 Hz
QTS
0.37
xmax
7.3 mm
SPL1W
90 dB
Bl/√RE
5.11
Pmax
500 W
6.5″Low frequency
fS
49 Hz
SD
154 cm²
70 - 7000 Hz
QTS
0.38
xmax
6.0 mm
SPL1W
90 dB
Bl/√RE
3.56
Pmax
300 W