8″ / 203 mm
Nominal diameter
85 Hz
Resonance
0.44
Q factor
92 dB
Sensitivity
± 6 mm
Linear excursion
400 W
Program Power
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
Sensitivity (1w, 1m, infinite baffle)
SPL1W
92.2
dB
Frequency response
70 - 6000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
84.8
Hz
Mechanical quality factor
QMS
2.34
Electrical quality factor
QES
0.54
Total quality factor
QTS
0.44
Large signal parameters
Maximum linear excursion
xmax
6.0
mm
Air volume displaced at xmax
VD
136
cm³
Power handling
P
200
W
Program power
Pmax
400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.8
Ω
Inductance (1kHz)
LE
0.59
mH
VC Diameter
50
mm
Winding height
HVC
16
mm
Winding material
Round copper
Magnet
Force factor
Bl
11.98
N/A
Motor constant
Bl/√RE
4.98
N/√W
Air gap height
HAG
8
mm
Diaphragm
Effective diameter
170
mm
Effective area
SD
227
cm²
Moving mass
MMS
24.9
g
Moving mass (without air load)
MMD
22.3
g
Material
Kevlar loaded paper (weather-resistant)
Suspensions
Stiffness
KMS
7.14
N/mm
Compliance
CMS
140
µm/N
Equivalent volume to the compliance
VAS
10.3
L
Mechanical resistance
RMS
5.66
N·s/m
Surround material
Cloth-sealed
Dimensions
Nominal diameter
8
″
203
mm
Overall diameter
225
mm
Baffle cutout diameter
100
mm
Overall depth
100
mm
Volume occupied by the driver (estimated)
0.7
L
Net weight
1.5
kg
Frame material
Cast aluminium
Similar speaker drivers to Celestion NTR08-2011D
8″Woofer
fS
82 Hz
SD
222 cm²
80 - 3000 Hz
QTS
0.41
xmax
6.3 mm
SPL1W
92 dB
Bl/√RE
5.52
Pmax
500 W
8″Low frequency
fS
81 Hz
SD
214 cm²
80 - 5000 Hz
QTS
0.43
xmax
3.8 mm
SPL1W
92 dB
Bl/√RE
5.41
Pmax
500 W
6.5″Woofer
fS
80 Hz
SD
143 cm²
80 - 3500 Hz
QTS
0.43
xmax
5.0 mm
SPL1W
92 dB
Bl/√RE
3.35
Pmax
260 W