Celestion NTR08-2009D
Low frequency
8″ / 203 mm
Nominal diameter
71 Hz
Resonance
0.21
Q factor
94 dB
Sensitivity
± 6.5 mm
Linear excursion
400 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.1
dB
Frequency response
70 - 5000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
71.4
Hz
Mechanical quality factor
QMS
2.04
Electrical quality factor
QES
0.24
Total quality factor
QTS
0.21
Large signal parameters
Maximum linear excursion
xmax
6.5
mm
Air volume displaced at xmax
VD
148
cm³
Power handling
P
200
W
Program power
Pmax
400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.5
Ω
Inductance (1kHz)
LE
0.48
mH
VC Diameter
50
mm
Winding height
HVC
18
mm
Winding material
Edgewound copper
Former material
Glass fibre
Magnet
Force factor
Bl
18.03
N/A
Motor constant
Bl/√RE
7.69
N/√W
Air gap height
HAG
10
mm
Material
Neodymium
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
31.1
g
Moving mass (without air load)
MMD
28.4
g
Material
Kevlar loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
6.25
N/mm
Compliance
CMS
160
µm/N
Equivalent volume to the compliance
VAS
11.7
L
Mechanical resistance
RMS
6.85
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
8
″
203
mm
Overall diameter
225
mm
Baffle cutout diameter
187
mm
Overall depth
100
mm
Volume occupied by the driver (estimated)
1.0
L
Net weight
2.8
kg
Frame material
Cast aluminium
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8″Mid Bass
fS
74 Hz
SD
220 cm²
70 - 5000 Hz
QTS
0.21
xmax
6.0 mm
SPL1W
95 dB
Bl/√RE
7.76
Pmax
400 W
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8″Low frequency
fS
74 Hz
SD
214 cm²
70 - 5000 Hz
QTS
0.24
xmax
3.8 mm
SPL1W
95 dB
Bl/√RE
7.02
Pmax
600 W
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8″Woofer
fS
80 Hz
SD
220 cm²
80 - 5000 Hz
QTS
0.23
xmax
5.8 mm
SPL1W
95 dB
Bl/√RE
7.79
Pmax
400 W