P.Audio C18-650EL v3

Low frequency

18″ / 457 mm
Nominal diameter
41 Hz
Resonance
0.52
Q factor
96 dB
Sensitivity
± 5.25 mm
Linear excursion
2000 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
95.5
dB
Frequency response
35 - 1000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
41.0
Hz
Mechanical quality factor
QMS
12.26
Electrical quality factor
QES
0.55
Total quality factor
QTS
0.52

Large signal parameters

Maximum linear excursion
xmax
5.25
mm
Air volume displaced at xmax
VD
643
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.6
Ω
Inductance (1kHz)
LE
0.83
mH
VC Diameter
99
mm
Winding height
HVC
25.5
mm
Winding material
Flat aluminium wire
Former material
Glass fiber

Magnet

Flux density
B
1.0
T
Force factor
Bl
21.46
N/A
Motor constant
Bl/√RE
9.07
N/√W
Air gap height
HAG
15
mm
Material
Ferrite

Diaphragm

Effective diameter
396
mm
Effective area
SD
1225
cm²
Moving mass
MMS
172.4
g
Moving mass (without air load)
MMD
143.7
g
Material
Paper

Suspensions

Stiffness
KMS
11.91
N/mm
Compliance
CMS
84
µm/N
Equivalent volume to the compliance
VAS
179
L
Mechanical resistance
RMS
3.62
N·s/m
Surround material
Cloth
Spider material
Cotton (Double)

Dimensions

Nominal diameter
18
457
mm
Overall diameter
446
mm
Baffle cutout diameter
426
mm
Overall depth
226
mm
Flange thickness
19
mm
Mounting depth
207
mm
Volume occupied by the driver (estimated)
7.7
L
Net weight
13.9
kg
Frame material
Aluminium
P.Audio C18-650EL v3 SPL & Impedance
P.Audio C18-650EL v3 Dimensions

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