Fostex FF85WK

Full-range

3.2″ / 80 mm
Nominal diameter
115 Hz
Resonance
0.55
Q factor
86 dB
Sensitivity
± 0.35 mm
Linear excursion
15 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
86.0
dB
Frequency response
115 - 28000
Hz

Thiele & Small parameters

Resonance frequency (free air)
fS
115
Hz
Mechanical quality factor
QMS
3.30
Electrical quality factor
QES
0.68
Total quality factor
QTS
0.55

Large signal parameters

Maximum linear excursion
xmax
0.35
mm
Air volume displaced at xmax
VD
1.0
cm³
Power handling
P
5
W
Program power
Pmax
15
W

Voice Coil

Nominal impedance
Z
8
Ω
DC resistance
RE
7.2
Ω
Inductance (1kHz)
LE
0.03
mH
VC Diameter
16
mm

Magnet

Force factor
Bl
3.93
N/A
Motor constant
Bl/√RE
1.46
N/√W
Weight
0.187
kg

Diaphragm

Effective diameter
60
mm
Effective area
SD
28
cm²
Moving mass
MMS
2
g
Moving mass (without air load)
MMD
1.9
g

Suspensions

Stiffness
KMS
1.1
N/mm
Compliance
CMS
909
µm/N
Equivalent volume to the compliance
VAS
1.04
L
Mechanical resistance
RMS
0.44
N·s/m

Dimensions

Nominal diameter
3.2
80
mm
Overall diameter
83
mm
Baffle cutout diameter
73
mm
Overall depth
47
mm
Volume occupied by the driver (estimated)
0.1
L
Net weight
0.45
kg
Fostex FF85WK SPL & Impedance
Fostex FF85WK Dimensions

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