VISATON FR 87 - 4 Ohm
Full-range
3.4″ / 87 mm
Nominal diameter
137 Hz
Resonance
1.25
Q factor
88 dB
Sensitivity
± 0.6 mm
Linear excursion
20 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
87.7
dB
Frequency response
100 - 20000
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
137
Hz
Mechanical quality factor
QMS
6.40
Electrical quality factor
QES
1.56
Total quality factor
QTS
1.25
Large signal parameters
Maximum linear excursion
xmax
0.6
mm
Maximum excursion before damage
xlim
2.0
mm
Air volume displaced at xmax
VD
2.2
cm³
Power handling
P
15
W
Program power
Pmax
20
W
Voice Coil
Nominal impedance
Z
4
Ω
DC resistance
RE
3.5
Ω
Inductance (1kHz)
LE
0.2
mH
VC Diameter
15
mm
Winding height
HVC
4.3
mm
Magnet
Force factor
Bl
2.1
N/A
Motor constant
Bl/√RE
1.12
N/√W
Air gap height
HAG
3
mm
Diaphragm
Effective diameter
69
mm
Effective area
SD
37
cm²
Moving mass
MMS
2
g
Moving mass (without air load)
MMD
1.8
g
Suspensions
Stiffness
KMS
1.49
N/mm
Compliance
CMS
670
µm/N
Equivalent volume to the compliance
VAS
1.3
L
Mechanical resistance
RMS
0.27
N·s/m
Dimensions
Nominal diameter
3.4
″
87
mm
Baffle cutout diameter
80
mm
Net weight
0.21
kg
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SD
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SD
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