Fountek FR89EX

Full-range

3.5″ / 89 mm
Nominal diameter
97 Hz
Resonance
0.52
Q factor
85 dB
Sensitivity
± 5 mm
Linear excursion
50 W
Program Power
Fountek FR89EX Full-rangeFountek FR89EX Full-rangeFountek FR89EX Full-range
Impedance
Excursion
Velocity
SPL
Phase
Group delay
Step response
Tone Burst
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
85.1
dB
Frequency response
70 - 20000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
97.0
Hz
Mechanical quality factor
QMS
4.89
Electrical quality factor
QES
0.58
Total quality factor
QTS
0.52

Large signal parameters

Maximum linear excursion
xmax
5.0
mm
Air volume displaced at xmax
VD
14
cm³
Power handling
P
25
W
Program power
Pmax
50
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
5.8
Ω
Inductance (1kHz, estimated)
LE
0.13
mH
VC Diameter
25
mm
Winding height
HVC
5
mm
Winding material
Copper
Former material
Kapton

Magnet

Flux density
B
0.85
T
Force factor
Bl
3.69
N/A
Motor constant
Bl/√RE
1.53
N/√W
Air gap height
HAG
14
mm
Material
Neodymium

Diaphragm

Effective diameter
60
mm
Effective area
SD
28
cm²
Moving mass
MMS
2.2
g
Moving mass (without air load)
MMD
2.1
g

Suspensions

Stiffness
KMS
0.82
N/mm
Compliance
CMS
1217
µm/N
Equivalent volume to the compliance
VAS
1.4
L
Mechanical resistance
RMS
0.27
N·s/m

Dimensions

Nominal diameter
3.5
″
89
mm
Overall diameter
88
mm
Overall depth
47
mm
Volume occupied by the driver (estimated)
0.12
L
Net weight
0.525
kg
SPL & Impedance
Fountek FR89EX SPL & Impedance
Fountek FR89EX Dimensions

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