RCF LF18N408
Subwoofer
18″ / 457 mm
Nominal diameter
30 Hz
Resonance
0.33
Q factor
93 dB
Sensitivity
± 15 mm
Linear excursion
3000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
93.4
dB
Frequency response
25 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
3.60
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.33
Large signal parameters
Maximum linear excursion
xmax
15.0
mm
Maximum excursion before damage
xlim
29.0
mm
Air volume displaced at xmax
VD
1830
cm³
Power handling
P
1500
W
Program power
Pmax
3000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
4.3
Ω
Inductance (1kHz)
LE
1.56
mH
VC Diameter
102
mm
Winding height
HVC
38
mm
Winding material
Copper
Magnet
Force factor
Bl
25.7
N/A
Motor constant
Bl/√RE
12.4
N/√W
Air gap height
HAG
15
mm
Diaphragm
Effective diameter
395
mm
Effective area
SD
1220
cm²
Moving mass
MMS
284
g
Moving mass (without air load)
MMD
254.2
g
Suspensions
Stiffness
KMS
10.42
N/mm
Compliance
CMS
96
µm/N
Equivalent volume to the compliance
VAS
193
L
Mechanical resistance
RMS
14.87
N·s/m
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
465
mm
Baffle cutout diameter
425
mm
Overall depth
224
mm
Volume occupied by the driver
5.5
L
Net weight
9.0
kg
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fS
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SD
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30 - 800 Hz
QTS
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xmax
15.0 mm
SPL1W
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Bl/√RE
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Pmax
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fS
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SD
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fS
32 Hz
SD
1210 cm²
35 - 1500 Hz
QTS
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xmax
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SPL1W
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Pmax
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