Eminence DELTA PRO-18C

Subwoofer

18″ / 457 mm
Nominal diameter
27 Hz
Resonance
0.32
Q factor
96 dB
Sensitivity
± 6.7 mm
Linear excursion
1000 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
Sensitivity (1W, 1m, infinite baffle)
SPL1W
95.7
dB
Frequency response
35 - 200
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
27.0
Hz
Mechanical quality factor
QMS
13.24
Electrical quality factor
QES
0.32
Total quality factor
QTS
0.32

Large signal parameters

Maximum linear excursion
xmax
6.7
mm
Maximum excursion before damage
xlim
15.0
mm
Air volume displaced at xmax
VD
796
cm³
Power handling
P
500
W
Program power
Pmax
1000
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
3.8
Ω
Inductance (1kHz)
LE
2.65
mH
VC Diameter
64
mm
Winding material
Copper
Former material
Polyimide

Magnet

Force factor
Bl
16.5
N/A
Motor constant
Bl/√RE
8.46
N/√W
Air gap height
HAG
9.7
mm
Weight
1.899
kg
Material
Ferrite

Diaphragm

Effective diameter
389
mm
Effective area
SD
1188
cm²
Moving mass
MMS
137
g
Moving mass (without air load)
MMD
108.5
g
Material
Paper

Suspensions

Stiffness
KMS
4.0
N/mm
Compliance
CMS
250
µm/N
Equivalent volume to the compliance
VAS
489
L
Mechanical resistance
RMS
1.76
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
6.01
L
Net weight
7.71
kg
Frame material
Die-cast aluminum
Eminence DELTA PRO-18C SPL & Impedance

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fS
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SD
1241 cm²
26 - 2000 Hz
QTS
0.33
xmax
6.0 mm
SPL1W
95 dB
Bl/√RE
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Pmax
1000 W