Fountek FR135EX

Full-range

5.5″ / 135 mm
Nominal diameter
62 Hz
Resonance
0.49
Q factor
85 dB
Sensitivity
± 5 mm
Linear excursion
80 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
84.9
dB
Frequency response
50 - 26000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
61.5
Hz
Mechanical quality factor
QMS
1.71
Electrical quality factor
QES
0.69
Total quality factor
QTS
0.49

Large signal parameters

Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
35
cm³
Power handling
P
40
W
Program power
Pmax
80
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
6.0
Ω
Inductance (1kHz, estimated)
LE
0.28
mH
VC Diameter
32
mm
Winding height
HVC
4
mm
Winding material
Copper
Former material
Black Aluminum

Magnet

Flux density
B
0.88
T
Force factor
Bl
5.03
N/A
Motor constant
Bl/√RE
2.05
N/√W
Air gap height
HAG
14
mm
Material
Neodymium

Diaphragm

Effective diameter
95
mm
Effective area
SD
71
cm²
Moving mass
MMS
7.5
g
Moving mass (without air load)
MMD
7.1
g

Suspensions

Stiffness
KMS
1.13
N/mm
Compliance
CMS
887
µm/N
Equivalent volume to the compliance
VAS
2.26
L
Mechanical resistance
RMS
1.71
N·s/m

Dimensions

Nominal diameter
5.5
135
mm
Overall diameter
146
mm
Overall depth
73
mm
Volume occupied by the driver (estimated)
0.32
L
Net weight
0.95
kg
Fountek FR135EX SPL & Impedance
Fountek FR135EX Dimensions

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