OWNER’S MANUAL
Specifications & Thiele/Small Parameters
FF85WK
80mm/3.2”
83mm/3.3”
73mm/2.9”
FF105WK
100mm/4.0” 120mm/4.8”
107mm/4.3” 117mm/4.7”
FF125WK
FF165WK
160mm/6.3”
166mm/6.6”
146mm/5.8”
FF225WK
200mm/7.9”
208mm/8.2”
185mm/7.3”
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FF85WK
Size
FF105WK
FF125WK
FF165WK
FF225WK
Standard enclosure
Inner volume
Bass-Reflex Bass-Reflex Bass-Reflex Bass-Reflex Bass-Reflex
Overall diameter
Baffle hole diameter
Depth
Voice coil diameter
Cast / Stamped
Impedance
Reproduction frequency response
Sound pressure level
Rated input
Music power
Magnet weight
Net weight
3.5
108
149
223
65
6
9
18
28
93mm/3.7”
104mm/4.1”
W (inside dimension)
D (inside dimension)
H (inside dimension)
Height to the center
of unit (H1)
128
192
264
65
142
218
296
70
200
237
380
100
230
280
435
110
46.7mm/2.0” 52.8mm/3.0” 61.3mm/3.0” 76.6mm/4.0” 91.7mm/4.0”
16mm/0.7”
Stamped
ꢀї
fs ~ 28kHz
86.5dB/W(m) 88dB/W(m)
20mm/0.8”
Stamped
ꢀї
25mm/1.0”
Stamped
ꢀї
fs ~ 22kHz
89dB/W(m)
16W
35mm/1.4”
Stamped
ꢀї
fs ~ 21kHz
92dB/W(1m) 93dB/W(1m)
50mm/2.0”
Stamped
ꢀї
Height to the center
of duct (H2)
55
60
60
90
100
fs ~ 25kHz
fs ~ 17kHz
FULL RANGE SPEAKER UNIT
Duct length (L)
100
ø40
85
100
ø40
145
ø65
190
ø65
Duct diameter (øD)
Tuning frequency (fb)
ø40
5W
15W
10W
30W
30W
90W
34W
100W
92Hz
72 Hz
57 Hz
54 Hz
39 Hz
50W
187g/0.412lb 340g/0.750lb 388g/0.855lb 848g/1.869lb 1,067g/2.352lb
450g/0.992lb 800g/1.764lb 920g/2.028lb 1,950g/4.299lb 3,520g/7.760lb
W
D
30mm
60mm
0.0028m2
ꢀї
115Hz
ꢁꢂꢃї
0.032mH
3.298
0.683
0.55
40mm
80mm
0.005m2
ꢀї
75Hz
ꢄꢂꢁї
0.041mH
4.203
0.463
0.41
46mm
92mm
0.0066m2
ꢀї
67Hz
ꢄꢂꢁї
0.044mH
5.091
0.464
0.42
65mm
130mm
0.0132m2
ꢀї
50Hz
ꢄꢂꢅї
0.056mH
4.19
0.373
0.34
9.5g
84mm
168mm
0.022m2
ꢀї
44Hz
ꢄї
0.068mH
2.31
0.409
0.35
18.4g
Equivalent diaphragm radius
Effective cone diameter
Surface area of cone
Nominal impedance
Resonance frequency
DC resistance
Coil inductance
Mechanical Q
Electromagnetic Q
Total Q
a
D
Sd
Zn
Fs
Re
Le
Qms
Qes
Qts
D
2g
3.4g
5g
Equivalent mass
BL product (Factor force)
Mms
BL
3.93Tesla/m 4.823Tesla/m 5.596Tesla/m 7.227Tesla/m 8.488Tesla/m
1.036L
0.35mm
0.246%
4.848L
1.7mm
0.42%
7.265L
1.65mm
0.451%
27.838L
1.85mm
0.908%
57.898L
2.25mm
0.995%
Compliance equivalent volume Vas
L
Voice coil overhang
Reference efficiency n0
Xmax
Eff/n0
Mechanical compliance of
suspension
Efficiency bandwidth product
0.909m/N
168.375
1.346m/N
161.987
1.153m/N
144.397
1.068m/N
134.048
0.826m/N
107.579
Cms
EBP
The lightning flash with arrowhead symbol, within an equilat-
eral triangle, is intended to alert the user to the presence of
uninsulated "dangerous voltage" within the product's enclo-
sure that may be of sufficient magnitude to constitute a risk of
electric shock to persons.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the appliance.
NO USER - SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
Avertissement:
Pour réduire le risque d’incendie ou de choc électrique, ne pas
exposer cet appareil sous la pluie et l’humidité.
WARNING:
To reduce the risk of fire or electric shock, do not expose
apparatus to rain or moisture.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
13. Unplug this apparatus during lightning storms or when unused for
long periods of time.
3. Heed all warnings.
4. Follow all Instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with
the manufacturer’s instructions.
14. Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way, such
as power-supply cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been
dropped.
8. Do not install near any heat sources such as radiators, heat 15. The apparatus shall be used in an open area.
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
9. Do not defeat the safety purpose of the polarized or grounding -
type plug. A polarized plug has two blades with one wider than the
other. A grounding type plug has two blades and a third grounding
prong. The wide blade or the third prong are provided for your
Cet appareil doit être utilisé dans un endroit a aire ouverte.
16. Apparatus shall not be exposed to dripping or splashing and that no
objects filled with liquids, such as vases, shall be placed on appara-
tus.
L’appareil ne doit pas êclaboussures et aucun objet ne contenant
de liquide, tel qu’un vase, ne doit être placé sur lobjet.
safety. If the provided plug does not fit into your outlet, consult an 17. Mains plug is used as disconnect device. It shall remain readily
electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particu-
larly at plugs, convenience receptacles, and the point where they
exit from the apparatus.
operable and should not be obstructed during intended use. To
completely disconnect the apparatus from supply mains, the mains
plug of the apparatus shall be disconnected from the mains socket
outlet completely.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or
table specified by the manufacturer, or sold with
the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to
avoid injury from tip-over.
La prise du secteur et utilisé pou déconnecter le système. La prise
du secteur ne doit pas être obstruée ou doit être facilement acces-
sible pendant son utilisation. Pour être complètement déconnecté
de l’alimentation d’entrée, la prise doit être débranchée du secteur.
Thank you for purchasing our product. FF-WK series are full-range speaker units ideally and exclusively
designed for a bass-reflex enclosure. The previous FF series speaker units construction has thoroughly been rede-
signed on the FF-WK series. With a new addition of 10-cm diameter speaker unit to the product range, new tech-
nologies such as a “double-layer” paper cone, a ridge-dome shape aluminum alloy center cap and a pocket neck
damper have been employed for high-quality sound. Even with these new technologies, FF-WK series inherit the
previous FF series bright and realistic sound character, and achieve a powerful low sound and non-characterized
high frequency sound reproduction. Please read this manual carefully before use.
FOSTEX CO.
3-2-35 Musashino, Akishima-shi, Tokyo, Japan 196-0021
PRINTED IN CHINA MARCH 2011 535483
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