Fi Car Audio HT-1 18 S4

Subwoofer

18″ / 470 mm
Nominal diameter
21 Hz
Resonance
0.51
Q factor
88 dB
Sensitivity
± 27 mm
Linear excursion
2000 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
87.8
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
20.9
Hz
Mechanical quality factor
QMS
5.75
Electrical quality factor
QES
0.57
Total quality factor
QTS
0.51

Large signal parameters

Maximum linear excursion
xmax
27.0
mm
Air volume displaced at xmax
VD
3267
cm³
Power handling
P
1000
W
Program power
Pmax
2000
W

Voice Coil

Nominal impedance
Z
4
Ω
DC resistance
RE
2.9
Ω
Inductance (1kHz, estimated)
LE
1.81
mH

Magnet

Force factor
Bl
18.77
N/A
Motor constant
Bl/√RE
11.1
N/√W

Diaphragm

Effective diameter
393
mm
Effective area
SD
1210
cm²
Moving mass
MMS
518
g
Moving mass (without air load)
MMD
488.2
g

Suspensions

Stiffness
KMS
9.23
N/mm
Compliance
CMS
108
µm/N
Equivalent volume to the compliance
VAS
222
L
Mechanical resistance
RMS
11.83
N·s/m

Dimensions

Nominal diameter
18
470
mm
Overall diameter
470
mm
Baffle cutout diameter
425
mm
Mounting depth
165
mm
Volume occupied by the driver
5.1
L

Export this driver to a simulation software:

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MTX Audio RT15-04 Subwoofer
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fS
20 Hz
SD
829 cm²
20 - 200 Hz
QTS
0.48
xmax
16.0 mm
SPL1W
87 dB
Bl/√RE
8.01
Pmax
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