18″ / 457 mm
Nominal diameter
38 Hz
Resonance
0.48
Q factor
94 dB
Sensitivity
± 8.5 mm
Linear excursion
2400 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
94.0
dB
Frequency response
35 - 1000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
38.0
Hz
Mechanical quality factor
QMS
9.76
Electrical quality factor
QES
0.50
Total quality factor
QTS
0.48
Large signal parameters
Maximum linear excursion
xmax
8.5
mm
Air volume displaced at xmax
VD
1041
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.9
Ω
Inductance (1kHz)
LE
0.98
mH
VC Diameter
114
mm
Winding height
HVC
31
mm
Former material
Glass fiber
Magnet
Flux density
B
1.2
T
Force factor
Bl
26.82
N/A
Motor constant
Bl/√RE
11.0
N/√W
Air gap height
HAG
14
mm
Diaphragm
Effective diameter
395
mm
Effective area
SD
1225
cm²
Moving mass
MMS
243.9
g
Moving mass (without air load)
MMD
213.8
g
Suspensions
Stiffness
KMS
14.29
N/mm
Compliance
CMS
70
µm/N
Equivalent volume to the compliance
VAS
149
L
Mechanical resistance
RMS
5.97
N·s/m
Spider material
Cotton (Double Silicone)
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
467
mm
Baffle cutout diameter
425
mm
Overall depth
224
mm
Flange thickness
23
mm
Mounting depth
201
mm
Volume occupied by the driver (estimated)
9.3
L
Net weight
18.1
kg
Similar speaker drivers to P.Audio C18-1200
15″Subwoofer
fS
39 Hz
SD
880 cm²
35 - 2500 Hz
QTS
0.42
xmax
8.0 mm
SPL1W
95 dB
Bl/√RE
8.08
Pmax
1200 W
15″Low frequency
fS
37 Hz
SD
897 cm²
35 - 2000 Hz
QTS
0.43
xmax
6.0 mm
SPL1W
94 dB
Bl/√RE
8.31
Pmax
1400 W
18″Low frequency
fS
36 Hz
SD
1225 cm²
30 - 1000 Hz
QTS
0.45
xmax
8.3 mm
SPL1W
94 dB
Bl/√RE
11
Pmax
2400 W