Eminence KAPPA PRO 18LF-8

Subwoofer

18″ / 457 mm
Nominal diameter
32 Hz
Resonance
0.33
Q factor
97 dB
Sensitivity
± 8 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
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Specifications

Sensitivity (1w, 1m, infinite baffle)
SPL1W
96.8
dB
Frequency response
38 - 700
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
32.0
Hz
Mechanical quality factor
QMS
10.66
Electrical quality factor
QES
0.34
Total quality factor
QTS
0.33

Large signal parameters

Maximum linear excursion
xmax
8.0
mm
Maximum excursion before damage
xlim
18.0
mm
Air volume displaced at xmax
VD
927
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
1.21
mH
VC Diameter
76
mm
Winding material
Copper
Former material
Kapton

Magnet

Force factor
Bl
19.39
N/A
Motor constant
Bl/√RE
8.35
N/√W
Air gap height
HAG
9.5
mm
Weight
3.402
kg
Material
Ferrite

Diaphragm

Effective diameter
384
mm
Effective area
SD
1159
cm²
Moving mass
MMS
119
g
Moving mass (without air load)
MMD
91.2
g
Material
Treated paper

Suspensions

Stiffness
KMS
4.76
N/mm
Compliance
CMS
210
µm/N
Equivalent volume to the compliance
VAS
392
L
Mechanical resistance
RMS
2.24
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
11.11
kg
Frame material
Die-cast aluminum
Eminence KAPPA PRO 18LF-8 SPL & Impedance

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