P.Audio 18NT-115XB

Low frequency

18″ / 457 mm
Nominal diameter
40 Hz
Resonance
0.44
Q factor
94 dB
Sensitivity
± 9.8 mm
Linear excursion
3200 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
Discard
Apply
Sensitivity (1W, 1m, infinite baffle)
SPL1W
93.8
dB
Frequency response
35 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
40.0
Hz
Mechanical quality factor
QMS
13.27
Electrical quality factor
QES
0.45
Total quality factor
QTS
0.44

Large signal parameters

Maximum linear excursion
xmax
9.8
mm
Air volume displaced at xmax
VD
1201
cm³
Power handling
P
1600
W
Program power
Pmax
3200
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
0.98
mH
VC Diameter
114
mm
Winding height
HVC
33
mm
Winding material
Copper
Former material
Glass fiber

Magnet

Flux density
B
1.2
T
Force factor
Bl
28.96
N/A
Motor constant
Bl/√RE
12.7
N/√W
Air gap height
HAG
13.5
mm
Material
Neodymium

Diaphragm

Effective diameter
395
mm
Effective area
SD
1225
cm²
Moving mass
MMS
288.3
g
Moving mass (without air load)
MMD
258.3
g
Material
Waterproof Paper

Suspensions

Stiffness
KMS
18.87
N/mm
Compliance
CMS
53
µm/N
Equivalent volume to the compliance
VAS
113
L
Mechanical resistance
RMS
5.46
N·s/m
Surround material
Cloth
Spider material
Double Silicone

Dimensions

Nominal diameter
18
457
mm
Overall diameter
466
mm
Baffle cutout diameter
430
mm
Overall depth
253
mm
Flange thickness
21
mm
Mounting depth
232
mm
Volume occupied by the driver (estimated)
7.9
L
Net weight
12.3
kg
Frame material
Aluminium
P.Audio 18NT-115XB SPL & Impedance
P.Audio 18NT-115XB Dimensions

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