RCF LF21N451

Subwoofer

21″ / 533 mm
Nominal diameter
30 Hz
Resonance
0.26
Q factor
96 dB
Sensitivity
± 13 mm
Linear excursion
3000 W
Program Power
RCF LF21N451 SubwooferRCF LF21N451 Subwoofer
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply

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Specifications

Sensitivity (1W, 1m, infinite baffle)
SPL1W
96.4
dB
Frequency response
30 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
6.10
Electrical quality factor
QES
0.27
Total quality factor
QTS
0.26

Large signal parameters

Maximum linear excursion
xmax
13.0
mm
Maximum excursion before damage
xlim
29.0
mm
Air volume displaced at xmax
VD
2210
cm³
Power handling
P
1500
W
Program power
Pmax
3000
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
3.0
mH
VC Diameter
114
mm
Winding height
HVC
34
mm
Winding material
Copper

Magnet

Force factor
Bl
34.5
N/A
Motor constant
Bl/√RE
14.6
N/√W
Air gap height
HAG
15
mm

Diaphragm

Effective diameter
470
mm
Effective area
SD
1700
cm²
Moving mass
MMS
315
g
Moving mass (without air load)
MMD
266.1
g

Suspensions

Stiffness
KMS
10.87
N/mm
Compliance
CMS
92
µm/N
Equivalent volume to the compliance
VAS
375
L
Mechanical resistance
RMS
9.73
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
249
mm
Volume occupied by the driver
6.5
L
Net weight
10.9
kg
Impedance
SPL
RCF LF21N451 Impedance
RCF LF21N451 SPL
RCF LF21N451 Dimensions
DatasheetDatasheet

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