Celestion NTR21-5010JD
Low frequency
21″ / 530 mm
Nominal diameter
32 Hz
Resonance
0.32
Q factor
96 dB
Sensitivity
± 9 mm
Linear excursion
3200 W
Program Power
Discontinued
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
95.5
dB
Frequency response
30 - 3000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
32.2
Hz
Mechanical quality factor
QMS
5.82
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.32
Large signal parameters
Maximum linear excursion
xmax
9.0
mm
Air volume displaced at xmax
VD
1496
cm³
Power handling
P
1600
W
Program power
Pmax
3200
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
2.25
mH
VC Diameter
125
mm
Winding height
HVC
30
mm
Winding material
Round copper
Former material
Glass fibre
Magnet
Force factor
Bl
33.85
N/A
Motor constant
Bl/√RE
14.3
N/√W
Air gap height
HAG
12
mm
Material
Neodymium
Diaphragm
Effective diameter
460
mm
Effective area
SD
1662
cm²
Moving mass
MMS
344.1
g
Moving mass (without air load)
MMD
296.2
g
Material
Carbon fibre loaded paper
Suspensions
Stiffness
KMS
14.29
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
277
L
Mechanical resistance
RMS
11.98
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
21
″
530
mm
Overall diameter
550
mm
Baffle cutout diameter
492
mm
Overall depth
254
mm
Volume occupied by the driver (estimated)
9.0
L
Net weight
12.8
kg
Frame material
Cast aluminium
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fS
31 Hz
SD
1225 cm²
28 - 2500 Hz
QTS
0.29
xmax
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SPL1W
96 dB
Bl/√RE
11
Pmax
1400 W
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18″Subwoofer
fS
30 Hz
SD
1220 cm²
28 - 2500 Hz
QTS
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xmax
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SPL1W
96 dB
Bl/√RE
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Pmax
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fS
32 Hz
SD
1217 cm²
30 - 3000 Hz
QTS
0.34
xmax
6.5 mm
SPL1W
95 dB
Bl/√RE
11
Pmax
1600 W