Fi Car Audio BTL4 15 D2

2x1Ω
2x2Ω

Subwoofer

15″ / 397 mm
Nominal diameter
27 Hz
Resonance
0.46
Q factor
87 dB
Sensitivity
± 33 mm
Linear excursion
7000 W
Program Power
Fi Car Audio BTL4 15 D2 SubwooferFi Car Audio BTL4 15 D2 SubwooferFi Car Audio BTL4 15 D2 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
86.8
dB

Thiele & Small parameters

Resonance frequency (free air)
fS
27.2
Hz
Mechanical quality factor
QMS
6.66
Electrical quality factor
QES
0.50
Total quality factor
QTS
0.46

Large signal parameters

Maximum linear excursion
xmax
33.0
mm
Air volume displaced at xmax
VD
2673
cm³
Power handling
P
3500
W
Program power
Pmax
7000
W

Voice Coil

Nominal impedance
Z
2 x 2
Ω
DC resistance (in series)
RE
2.8
Ω
Inductance (1kHz, in series, estimated)
LE
1.58
mH

Magnet

Force factor (in series)
Bl
20.2
N/A
Motor constant
Bl/√RE
12.1
N/√W

Diaphragm

Effective diameter
321
mm
Effective area
SD
810
cm²
Moving mass
MMS
430
g
Moving mass (without air load)
MMD
413.2
g

Suspensions

Stiffness
KMS
12.82
N/mm
Compliance
CMS
78
µm/N
Equivalent volume to the compliance
VAS
71.1
L
Mechanical resistance
RMS
11.03
N·s/m

Dimensions

Nominal diameter
15
″
397
mm
Overall diameter
397
mm
Baffle cutout diameter
359
mm
Mounting depth
222
mm
Volume occupied by the driver
2.55
L
Impedance
Step response
Tone Burst

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