Fostex FF85K DATA SHEET
FULL RANGE SPEAKER UNIT
FF85K
Features
•ø70mm large ferrite magnet
•Special paper cone made of ‘non-wood pulp fiber [KENAF] and bio-cellulose fiber
•UDR tangential edge
•Aluminum center radiator connected onto voice coil
Specifications |
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Thiele/Small Parameters |
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Size |
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80 |
mm / |
3 in |
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Voice Coil Diameter |
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20 |
mm / |
1 in |
Frequency Response / Impedance |
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Cast / Stamped |
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Stamped |
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Impedance |
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8 |
Ω |
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110 |
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Reproduction Frequency Response |
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: f0 - 125kHz |
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100 |
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90 |
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Sound Pressure Level |
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80 |
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88 |
dB/W(m) |
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0º |
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70 |
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Rated Input |
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5 |
W |
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30ºΩ |
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60 |
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60º |
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Music Power |
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10 |
W |
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16 |
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50 |
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Magnet Material |
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Ferrite |
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8 |
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Impedance |
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4 |
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Magnet Weight |
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(dB) |
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(main) |
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228.3 |
g / |
0.503 |
lb |
20 Hz |
50 |
100 200 |
500 |
1k |
2k |
5k |
10k |
20k |
40k |
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(cancel) |
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n/a |
g / |
n/a |
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lb |
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Net Weight |
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565.0 |
g / |
1.246 |
lb |
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Dimensions & Mounting Information
a : |
3mm |
D : |
6mm |
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Sd : 0.00283m2 |
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Zn : |
8Ω |
Fs : |
122Hz |
Re : |
7.08Ω |
Le : |
n/amH |
Qms : |
5.54 |
Qes : |
0.52 |
Qts : |
0.47 |
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Mms : |
1.8g |
BL : |
4.33Telsa/m |
Vas : |
1.07L |
Xmax : |
0.55mm |
Eff/η0 : |
0.37% |
Cms : |
0.001mm/N |
EBP : |
235 |
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FF85K
FULL RANGE
IMP,8Ω Mus.15W
NOM.5W
4-4 x 6 hole
ø72
40
30 
¯86 |
¯70 |
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8 |
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15 |
(49) |
4 |
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6 |
¯77 |
¯77.4 |
83 |
Overall Diameter |
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83 |
mm / |
3 |
in |
Baffle Hole Diameter |
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72 |
mm / |
3 |
in |
Depth |
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49 |
mm / |
2 |
in |
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