18″ / 457 mm
Nominal diameter
33 Hz
Resonance
0.43
Q factor
95 dB
Sensitivity
± 8 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
95.1
dB
Frequency response
39 - 800
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
33.0
Hz
Mechanical quality factor
QMS
14.02
Electrical quality factor
QES
0.44
Total quality factor
QTS
0.43
Large signal parameters
Maximum linear excursion
xmax
8.0
mm
Maximum excursion before damage
xlim
20.2
mm
Air volume displaced at xmax
VD
927
cm³
Power handling
P
1200
W
Program power
Pmax
2400
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.4
Ω
Inductance (1kHz)
LE
1.47
mH
VC Diameter
102
mm
Former material
Glass Fiber
Magnet
Force factor
Bl
18.9
N/A
Motor constant
Bl/√RE
8.13
N/√W
Air gap height
HAG
12.7
mm
Weight
3.09
kg
Diaphragm
Effective diameter
384
mm
Effective area
SD
1159
cm²
Moving mass
MMS
140
g
Moving mass (without air load)
MMD
112.2
g
Material
Water resistant paper
Suspensions
Stiffness
KMS
5.88
N/mm
Compliance
CMS
170
µm/N
Equivalent volume to the compliance
VAS
317
L
Mechanical resistance
RMS
2.07
N·s/m
Surround material
Treated cloth
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
457
mm
Baffle cutout diameter
421
mm
Overall depth
211
mm
Volume occupied by the driver
6.7
L
Net weight
12.38
kg
Frame material
Die-cast aluminum
Similar subwoofers to Eminence IMPERO 18A
21″Subwoofer
fS
30 Hz
SD
1730 cm²
25 - 1000 Hz
QTS
0.37
xmax
11.0 mm
SPL1W
95 dB
Bl/√RE
12
Pmax
3000 W
18″Subwoofer
fS
30 Hz
SD
1207 cm²
30 - 3150 Hz
QTS
0.35
xmax
9.3 mm
SPL1W
96 dB
Bl/√RE
8.41
Pmax
1200 W
18″Subwoofer
fS
32 Hz
SD
1230 cm²
50 - 2000 Hz
QTS
0.36
xmax
8.7 mm
SPL1W
96 dB
Bl/√RE
9.21
Pmax
1200 W