Fi Car Audio Delta 18 D1

2x1Ω
2x2Ω

Subwoofer

18″ / 470 mm
Nominal diameter
38 Hz
Resonance
0.28
Q factor
93 dB
Sensitivity
± 34 mm
Linear excursion
9000 W
Program Power
Fi Car Audio Delta 18 D1 SubwooferFi Car Audio Delta 18 D1 SubwooferFi Car Audio Delta 18 D1 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
93.1
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
37.5
Hz
Mechanical quality factor
QMS
7.66
Electrical quality factor
QES
0.29
Total quality factor
QTS
0.28

Large signal parameters

Maximum linear excursion
xmax
34.0
mm
Air volume displaced at xmax
VD
4114
cm³
Power handling
P
4500
W
Program power
Pmax
9000
W

Voice Coil

Nominal impedance
Z
2 x 1
Ω
DC resistance (in series)
RE
1.4
Ω
Inductance (1kHz, in series, estimated)
LE
0.87
mH

Magnet

Force factor (in series)
Bl
23.6
N/A
Motor constant
Bl/√RE
19.9
N/√W

Diaphragm

Effective diameter
393
mm
Effective area
SD
1210
cm²
Moving mass
MMS
498
g
Moving mass (without air load)
MMD
468.2
g

Suspensions

Stiffness
KMS
27.03
N/mm
Compliance
CMS
37
µm/N
Equivalent volume to the compliance
VAS
76.2
L
Mechanical resistance
RMS
15.32
N·s/m

Dimensions

Nominal diameter
18
″
470
mm
Overall diameter
470
mm
Baffle cutout diameter
425
mm
Mounting depth
324
mm
Volume occupied by the driver
7.36
L
Impedance
Step response
Tone Burst

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