RCF LF21N401
Subwoofer
21″ / 533 mm
Nominal diameter
30 Hz
Resonance
0.37
Q factor
95 dB
Sensitivity
± 11 mm
Linear excursion
3000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.2
dB
Frequency response
25 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
6.80
Electrical quality factor
QES
0.40
Total quality factor
QTS
0.37
Large signal parameters
Maximum linear excursion
xmax
11.0
mm
Maximum excursion before damage
xlim
30.0
mm
Air volume displaced at xmax
VD
1903
cm³
Power handling
P
1500
W
Program power
Pmax
3000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.0
Ω
Inductance (1kHz)
LE
1.7
mH
VC Diameter
102
mm
Winding height
HVC
31
mm
Winding material
Copper
Magnet
Force factor
Bl
27.6
N/A
Motor constant
Bl/√RE
12.3
N/√W
Air gap height
HAG
15
mm
Diaphragm
Effective diameter
470
mm
Effective area
SD
1730
cm²
Moving mass
MMS
318
g
Moving mass (without air load)
MMD
268.3
g
Suspensions
Stiffness
KMS
11.49
N/mm
Compliance
CMS
87
µm/N
Equivalent volume to the compliance
VAS
374
L
Mechanical resistance
RMS
8.81
N·s/m
Spider material
with silicon damping
Dimensions
Nominal diameter
21
″
533
mm
Overall diameter
547
mm
Baffle cutout diameter
512
mm
Overall depth
234
mm
Volume occupied by the driver
6.5
L
Net weight
9.2
kg
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QSpeakers
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fS
32 Hz
SD
1230 cm²
50 - 2000 Hz
QTS
0.36
xmax
8.7 mm
SPL1W
96 dB
Bl/√RE
9.21
Pmax
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21″Subwoofer
fS
30 Hz
SD
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30 - 1000 Hz
QTS
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xmax
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SPL1W
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Bl/√RE
13
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fS
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SD
1159 cm²
39 - 800 Hz
QTS
0.43
xmax
8.0 mm
SPL1W
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Bl/√RE
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Pmax
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