Oberton 18B450
Woofer
18″ / 461 mm
Nominal diameter
34 Hz
Resonance
0.34
Q factor
96 dB
Sensitivity
± 7.25 mm
Linear excursion
1000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.6
dB
Frequency response
35 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
34.4
Hz
Mechanical quality factor
QMS
8.03
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
7.25
mm
Air volume displaced at xmax
VD
805
cm³
Power handling
P
500
W
Program power
Pmax
1000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.3
Ω
Inductance (1kHz)
LE
1.49
mH
VC Diameter
77
mm
Winding height
HVC
20
mm
Winding material
Copper
Former material
Glass fiber
Magnet
Flux density
B
1.2
T
Force factor
Bl
22.12
N/A
Motor constant
Bl/√RE
9.62
N/√W
Air gap height
HAG
11
mm
Material
Ferrite
Diaphragm
Effective diameter
376
mm
Effective area
SD
1110
cm²
Moving mass
MMS
152.8
g
Moving mass (without air load)
MMD
126
g
Material
Paper
Suspensions
Stiffness
KMS
7.14
N/mm
Compliance
CMS
140
µm/N
Equivalent volume to the compliance
VAS
242
L
Mechanical resistance
RMS
4.11
N·s/m
Dimensions
Nominal diameter
18
″
461
mm
Overall diameter
461
mm
Baffle cutout diameter
417
mm
Overall depth
193
mm
Volume occupied by the driver (estimated)
5.2
L
Net weight
8.55
kg
Frame material
Die cast aluminium
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SpeakerbenchSimilar subwoofers to Oberton 18B450
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fS
36 Hz
SD
1255 cm²
40 - 1000 Hz
QTS
0.34
xmax
11.0 mm
SPL1W
96 dB
Bl/√RE
12
Pmax
2400 W
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fS
36 Hz
SD
880 cm²
40 - 4000 Hz
QTS
0.34
xmax
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SPL1W
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Bl/√RE
7.69
Pmax
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18″Subwoofer
fS
33 Hz
SD
1131 cm²
35 - 1000 Hz
QTS
0.34
xmax
7.5 mm
SPL1W
95 dB
Bl/√RE
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Pmax
2000 W