BMS 12S320
Woofer
12″ / 318 mm
Nominal diameter
45 Hz
Resonance
0.2
Q factor
97 dB
Sensitivity
± 4.5 mm
Linear excursion
1000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.6
dB
Frequency response
45 - 2500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
45.4
Hz
Mechanical quality factor
QMS
4.20
Electrical quality factor
QES
0.21
Total quality factor
QTS
0.20
Large signal parameters
Maximum linear excursion
xmax
4.5
mm
Air volume displaced at xmax
VD
239
cm³
Power handling
P
500
W
Program power
Pmax
1000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.7
Ω
Inductance (1kHz)
LE
0.75
mH
VC Diameter
77
mm
Winding height
HVC
19
mm
Winding material
Copper
Magnet
Force factor
Bl
23.3
N/A
Motor constant
Bl/√RE
9.76
N/√W
Air gap height
HAG
10
mm
Material
Ferrite
Diaphragm
Effective diameter
260
mm
Effective area
SD
531
cm²
Moving mass
MMS
69
g
Moving mass (without air load)
MMD
60.2
g
Suspensions
Stiffness
KMS
5.68
N/mm
Compliance
CMS
176
µm/N
Equivalent volume to the compliance
VAS
69.5
L
Mechanical resistance
RMS
4.69
N·s/m
Dimensions
Nominal diameter
12
″
318
mm
Overall diameter
318
mm
Baffle cutout diameter
284
mm
Overall depth
149
mm
Volume occupied by the driver (estimated)
3.3
L
Net weight
8.1
kg
Frame material
Cast Aluminum
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SpeakerbenchSimilar woofers to BMS 12S320
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12″Subwoofer
fS
47 Hz
SD
550 cm²
50 - 4000 Hz
QTS
0.19
xmax
7.5 mm
SPL1W
97 dB
Bl/√RE
11
Pmax
1400 W
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10″Mid-range
fS
50 Hz
SD
380 cm²
70 - 4000 Hz
QTS
0.21
xmax
4.5 mm
SPL1W
96 dB
Bl/√RE
7.45
Pmax
700 W