RCF LF21X451
Subwoofer
21″ / 533 mm
Nominal diameter
28 Hz
Resonance
0.37
Q factor
95 dB
Sensitivity
± 14 mm
Linear excursion
4000 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.7
dB
Frequency response
28 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
28.0
Hz
Mechanical quality factor
QMS
6.90
Electrical quality factor
QES
0.39
Total quality factor
QTS
0.37
Large signal parameters
Maximum linear excursion
xmax
14.0
mm
Maximum excursion before damage
xlim
27.0
mm
Air volume displaced at xmax
VD
2380
cm³
Power handling
P
2000
W
Program power
Pmax
4000
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
2.9
mH
VC Diameter
114
mm
Winding height
HVC
34
mm
Winding material
Copper
Former material
Glass Fiber
Magnet
Force factor
Bl
30.5
N/A
Motor constant
Bl/√RE
13.1
N/√W
Air gap height
HAG
15
mm
Diaphragm
Effective diameter
470
mm
Effective area
SD
1700
cm²
Moving mass
MMS
355
g
Moving mass (without air load)
MMD
306.1
g
Suspensions
Stiffness
KMS
11.77
N/mm
Compliance
CMS
85
µm/N
Equivalent volume to the compliance
VAS
385
L
Mechanical resistance
RMS
9.05
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
245
mm
Volume occupied by the driver
6.5
L
Net weight
15.5
kg
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SpeakerbenchSimilar subwoofers to RCF LF21X451
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21″Subwoofer
fS
29 Hz
SD
1660 cm²
30 - 1000 Hz
QTS
0.37
xmax
14.0 mm
SPL1W
94 dB
Bl/√RE
14
Pmax
3200 W
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21″Subwoofer
fS
29 Hz
SD
1660 cm²
30 - 1800 Hz
QTS
0.37
xmax
15.0 mm
SPL1W
94 dB
Bl/√RE
14
Pmax
3200 W
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21″Subwoofer
fS
30 Hz
SD
1680 cm²
30 - 1000 Hz
QTS
0.37
xmax
14.0 mm
SPL1W
95 dB
Bl/√RE
13
Pmax
3400 W