Eminence DEFINIMAX 4018LF

Subwoofer

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
Discard
Apply

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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
Winding material
Copper
Former material
Polyimide

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
Material
Ferrite

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
Surround material
Cloth

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
Eminence DEFINIMAX 4018LF SPL & Impedance

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