Fountek FM135D-II
Mid-range
5.25″ / 135 mm
Nominal diameter
73 Hz
Resonance
0.28
Q factor
90 dB
Sensitivity
± 1.45 mm
Linear excursion
60 W
Program Power
.jpg)
.jpg)
Sensitivity (1w, 1m, infinite baffle)
SPL1W
90.4
dB
Frequency response
73 - 5500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
73.0
Hz
Mechanical quality factor
QMS
1.84
Electrical quality factor
QES
0.33
Total quality factor
QTS
0.28
Large signal parameters
Maximum linear excursion
xmax
1.45
mm
Air volume displaced at xmax
VD
12
cm³
Power handling
P
30
W
Program power
Pmax
60
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
6.3
Ω
Inductance (1kHz, estimated)
LE
0.29
mH
VC Diameter
36
mm
Winding height
HVC
10
mm
Winding material
Copper Clad Aluminium
Former material
Kapton
Magnet
Flux density
B
1.0
T
Force factor
Bl
7.96
N/A
Motor constant
Bl/√RE
3.17
N/√W
Air gap height
HAG
6
mm
Material
Ferrite
Diaphragm
Effective diameter
103
mm
Effective area
SD
83
cm²
Moving mass
MMS
7.2
g
Moving mass (without air load)
MMD
6.7
g
Suspensions
Stiffness
KMS
1.52
N/mm
Compliance
CMS
656
µm/N
Equivalent volume to the compliance
VAS
6.48
L
Mechanical resistance
RMS
1.8
N·s/m
Dimensions
Nominal diameter
5.25
″
135
mm
Overall diameter
132
mm
Overall depth
75
mm
Volume occupied by the driver (estimated)
0.47
L
Net weight
1.85
kg
.jpg)
.jpg)
Export this driver to a simulation software:
WinISD
Basta!
Hornresp
QSpeakers
SpeakerSim
MfbLabs
SpeakerbenchSimilar speaker drivers to Fountek FM135D-II
.png.webp)
4″Full-range
fS
70 Hz
SD
57 cm²
70 - 16000 Hz
QTS
0.32
xmax
3.3 mm
SPL1W
90 dB
Bl/√RE
2.29
Pmax
50 W
.png.webp)
.jpg.webp)
4″Full-range
fS
77 Hz
SD
50 cm²
77 - 23000 Hz
QTS
0.30
xmax
0.3 mm
SPL1W
92 dB
Bl/√RE
1.99
Pmax
24 W