18″ / 457 mm
Nominal diameter
30 Hz
Resonance
0.34
Q factor
94 dB
Sensitivity
± 8.57 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
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Specifications
Sensitivity (1w, 1m, infinite baffle)
SPL1W
94.3
dB
Frequency response
31 - 200
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
30.0
Hz
Mechanical quality factor
QMS
11.95
Electrical quality factor
QES
0.35
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
8.57
mm
Maximum excursion before damage
xlim
15.9
mm
Air volume displaced at xmax
VD
1018
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.1
Ω
Inductance (1kHz)
LE
4.54
mH
VC Diameter
102
mm
Magnet
Force factor
Bl
26.75
N/A
Motor constant
Bl/√RE
10.8
N/√W
Air gap height
HAG
9.5
mm
Weight
3.09
kg
Diaphragm
Effective diameter
389
mm
Effective area
SD
1188
cm²
Moving mass
MMS
217
g
Moving mass (without air load)
MMD
188.5
g
Material
Water resistant paper
Suspensions
Stiffness
KMS
7.69
N/mm
Compliance
CMS
130
µm/N
Equivalent volume to the compliance
VAS
255
L
Mechanical resistance
RMS
3.42
N·s/m
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
457
mm
Baffle cutout diameter
421
mm
Overall depth
207
mm
Volume occupied by the driver
6.62
L
Net weight
10.89
kg
Frame material
Die-cast aluminum
Similar subwoofers to Eminence DEFINIMAX 4018LF
21″Low frequency
fS
30 Hz
SD
1662 cm²
30 - 1000 Hz
QTS
0.34
xmax
15.0 mm
SPL1W
94 dB
Bl/√RE
15
Pmax
3600 W
21″Subwoofer
fS
31 Hz
SD
1662 cm²
25 - 1500 Hz
QTS
0.34
xmax
14.0 mm
SPL1W
95 dB
Bl/√RE
14
Pmax
3600 W
21″Subwoofer
fS
30 Hz
SD
1734 cm²
30 - 1000 Hz
QTS
0.29
xmax
14.0 mm
SPL1W
96 dB
Bl/√RE
16
Pmax
3200 W