BMS 18S450
Subwoofer
18″ / 458 mm
Nominal diameter
29 Hz
Resonance
0.31
Q factor
95 dB
Sensitivity
± 12 mm
Linear excursion
2400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.7
dB
Frequency response
20 - 200
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
29.0
Hz
Mechanical quality factor
QMS
7.25
Electrical quality factor
QES
0.32
Total quality factor
QTS
0.31
Large signal parameters
Maximum linear excursion
xmax
12.0
mm
Air volume displaced at xmax
VD
1456
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
1.1
mH
VC Diameter
102
mm
Winding height
HVC
36
mm
Winding material
Copper
Magnet
Force factor
Bl
26.5
N/A
Motor constant
Bl/√RE
11.3
N/√W
Air gap height
HAG
12
mm
Material
Ferrite
Diaphragm
Effective diameter
393
mm
Effective area
SD
1213
cm²
Moving mass
MMS
224
g
Moving mass (without air load)
MMD
194.8
g
Suspensions
Stiffness
KMS
7.46
N/mm
Compliance
CMS
134
µm/N
Equivalent volume to the compliance
VAS
281
L
Mechanical resistance
RMS
5.63
N·s/m
Dimensions
Nominal diameter
18
″
458
mm
Overall diameter
458
mm
Baffle cutout diameter
414
mm
Overall depth
233
mm
Volume occupied by the driver (estimated)
8.2
L
Net weight
14.5
kg
Frame material
Cast Aluminum
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SD
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SD
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