Acoustic Elegance IB18HT-4

4Ω
8Ω

Subwoofer

18″ / 457 mm
Nominal diameter
18 Hz
Resonance
0.57
Q factor
89 dB
Sensitivity
± 18 mm
Linear excursion
1000 W
Program Power
Acoustic Elegance IB18HT-4 SubwooferAcoustic Elegance IB18HT-4 Subwoofer
Excursion
Velocity
SPL
Phase
Group delay
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
89.4
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
18.4
Hz
Mechanical quality factor
QMS
5.70
Electrical quality factor
QES
0.63
Total quality factor
QTS
0.57

Large signal parameters

Maximum linear excursion
xmax
18.0
mm
Maximum excursion before damage
xlim
25.0
mm
Air volume displaced at xmax
VD
2192
cm³
Power handling
P
500
W
Program power
Pmax
1000
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
2.8
Ω
Inductance (1kHz)
LE
0.41
mH

Magnet

Force factor
Bl
11.31
N/A
Motor constant
Bl/√RE
6.76
N/√W

Diaphragm

Effective diameter
394
mm
Effective area
SD
1218
cm²
Moving mass
MMS
250
g
Moving mass (without air load)
MMD
220.7
g

Suspensions

Stiffness
KMS
3.33
N/mm
Compliance
CMS
300
µm/N
Equivalent volume to the compliance
VAS
632
L
Mechanical resistance
RMS
5.03
N·s/m

Dimensions

Nominal diameter
18
″
457
mm
Volume occupied by the driver (estimated)
6.9
L
Impedance
Step response
Tone Burst

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