Beyma 12BR70
Subwoofer
12″ / 300 mm
Nominal diameter
31 Hz
Resonance
0.5
Q factor
90 dB
Sensitivity
± 8 mm
Linear excursion
250 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
90.4
dB
Frequency response
35 - 4000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
31.0
Hz
Mechanical quality factor
QMS
4.40
Electrical quality factor
QES
0.56
Total quality factor
QTS
0.50
Large signal parameters
Maximum linear excursion
xmax
8.0
mm
Maximum excursion before damage
xlim
26.0
mm
Air volume displaced at xmax
VD
432
cm³
Power handling
P
125
W
Program power
Pmax
250
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
0.8
mH
VC Diameter
51
mm
Winding height
HVC
19
mm
Magnet
Force factor
Bl
12.1
N/A
Motor constant
Bl/√RE
5.11
N/√W
Air gap height
HAG
7
mm
Diaphragm
Effective diameter
262
mm
Effective area
SD
540
cm²
Moving mass
MMS
74
g
Moving mass (without air load)
MMD
65.2
g
Suspensions
Stiffness
KMS
2.9
N/mm
Compliance
CMS
345
µm/N
Equivalent volume to the compliance
VAS
142
L
Mechanical resistance
RMS
3.3
N·s/m
Dimensions
Nominal diameter
12
″
300
mm
Overall diameter
312
mm
Baffle cutout diameter
278
mm
Overall depth
134
mm
Volume occupied by the driver (estimated)
1.8
L
Net weight
3.6
kg
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SD
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SD
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xmax
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