18″ / 460 mm
Nominal diameter
30 Hz
Resonance
0.23
Q factor
96 dB
Sensitivity
± 9 mm
Linear excursion
1600 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
95.9
dB
Frequency response
25 - 2000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
3.20
Electrical quality factor
QES
0.25
Total quality factor
QTS
0.23
Large signal parameters
Maximum linear excursion
xmax
9.0
mm
Air volume displaced at xmax
VD
1188
cm³
Power handling
P
800
W
Program power
Pmax
1600
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
1.12
mH
VC Diameter
102
mm
Winding height
HVC
23
mm
Former material
Fiberglass
Magnet
Force factor
Bl
33.0
N/A
Motor constant
Bl/√RE
14.2
N/√W
Air gap height
HAG
10
mm
Diaphragm
Effective diameter
410
mm
Effective area
SD
1320
cm²
Moving mass
MMS
266
g
Moving mass (without air load)
MMD
233.8
g
Material
Paper/Kevlar fiber composite
Suspensions
Stiffness
KMS
8.33
N/mm
Compliance
CMS
120
µm/N
Equivalent volume to the compliance
VAS
312
L
Mechanical resistance
RMS
15.67
N·s/m
Dimensions
Nominal diameter
18
″
460
mm
Overall diameter
464
mm
Baffle cutout diameter
429
mm
Overall depth
181
mm
Volume occupied by the driver (estimated)
4.8
L
Net weight
8.0
kg
Frame material
Cast Aluminum
Similar subwoofers to Radian 2218Neo
15″Subwoofer
fS
28 Hz
SD
880 cm²
QTS
0.25
xmax
11.5 mm
SPL1W
95 dB
Bl/√RE
9.84
Pmax
2000 W
18″Subwoofer
fS
33 Hz
SD
1164 cm²
35 - 2000 Hz
QTS
0.24
xmax
11.1 mm
SPL1W
96 dB
Bl/√RE
14
Pmax
1600 W
18″Woofer
fS
36 Hz
SD
1158 cm²
30 - 1000 Hz
QTS
0.23
xmax
11.0 mm
SPL1W
96 dB
Bl/√RE
14
Pmax
3000 W