BMS 8C250

Coaxial

8″ / 205 mm
Nominal diameter
79 Hz
Resonance
0.52
Q factor
93 dB
Sensitivity
± 4.25 mm
Linear excursion
400 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
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
92.5
dB
Frequency response
70 - 3000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
79.1
Hz
Mechanical quality factor
QMS
4.85
Electrical quality factor
QES
0.61
Total quality factor
QTS
0.52

Large signal parameters

Maximum linear excursion
xmax
4.25
mm
Air volume displaced at xmax
VD
85
cm³
Power handling
P
200
W
Program power
Pmax
400
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz, estimated)
LE
0.43
mH
VC Diameter
51
mm
Winding height
HVC
15
mm
Winding material
Copper
Former material
Kapton

Magnet

Flux density
B
1.8
T
Force factor
Bl
9.95
N/A
Motor constant
Bl/√RE
4.28
N/√W
Air gap height
HAG
6.5
mm
Material
Ceramic

Diaphragm

Effective diameter
160
mm
Effective area
SD
201
cm²
Moving mass
MMS
18.3
g
Moving mass (without air load)
MMD
16.2
g
Material
Polyester

Suspensions

Stiffness
KMS
5.56
N/mm
Compliance
CMS
180
µm/N
Equivalent volume to the compliance
VAS
10.2
L
Mechanical resistance
RMS
1.88
N·s/m

Dimensions

Nominal diameter
8
205
mm
Overall diameter
205
mm
Baffle cutout diameter
182
mm
Overall depth
111
mm
Volume occupied by the driver (estimated)
1.1
L
Net weight
3.0
kg
Frame material
Cast Aluminum
BMS 8C250 Impedance
BMS 8C250 SPL
BMS 8C250 Dimensions

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