PRINTED IN CHINA MARCH 2011
535483
FULL RANGE SPEAKER UNIT
W
H
H1
H2
D
L
D
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.
Specifications & Thiele/Small Parameters
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
WARNING:
NO USER - SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
Read these instructions.
Keep these instructions.
Heed all warnings.
Follow all Instructions.
Do not use this apparatus near water.
Clean only with dry cloth.
Do not block any ventilation openings. Install in accordance with
the manufacturer’s instructions.
Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
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
safety. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.
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.
Only use attachments/accessories specified by the manufacturer.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Unplug this apparatus during lightning storms or when unused for
long periods of time.
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.
The apparatus shall be used in an open area.
Cet appareil doit être utilisé dans un endroit a aire ouverte.
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.
Mains plug is used as disconnect device. It shall remain readily
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.
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.
13.
14.
15.
16.
17.
To reduce the risk of fire or electric shock, do not expose
apparatus to rain or moisture.
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.
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.
IMPORTANT SAFETY INSTRUCTIONS
Avertissement:
Pour réduire le risque d’incendie ou de choc électrique, ne pas
exposer cet appareil sous la pluie et l’humidité.
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.
FOSTEX CO.
3-2-35 Musashino, Akishima-shi, Tokyo, Japan 196-0021
OWNER’S MANUAL
Standard enclosure
Inner volume
W (inside dimension)
D (inside dimension)
H (inside dimension)
Height to the center
of unit (H1)
Height to the center
of duct (H2)
Duct length (L)
Duct diameter (øD)
Tuning frequency (fb)
FF85WK
Bass-Reflex
3.5
108
149
223
65
55
100
ø40
92Hz
FF105WK
Bass-Reflex
6
128
192
264
65
60
85
ø40
72 Hz
FF125WK
Bass-Reflex
9
142
218
296
70
60
100
ø40
57 Hz
FF165WK
Bass-Reflex
18
200
237
380
100
90
145
ø65
54 Hz
FF225WK
Bass-Reflex
28
230
280
435
110
100
190
ø65
39 Hz
Size
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
Equivalent diaphragm radius
Effective cone diameter
Surface area of cone
Nominal impedance
Resonance frequency
DC resistance
Coil inductance
Mechanical Q
Electromagnetic Q
Total Q
Equivalent mass
BL product (Factor force)
Compliance equivalent volume
Voice coil overhang
Reference efficiency n0
Mechanical compliance of
suspension
Efficiency bandwidth product
FF85WK
80mm/3.2”
83mm/3.3”
73mm/2.9”
46.7mm/2.0”
16mm/0.7”
Stamped
ї
fs ~ 28kHz
86.5dB/W(m)
5W
15W
187g/0.412lb
450g/0.992lb
30mm
60mm
0.0028m
2
ї
115Hz
ї
0.032mH
3.298
0.683
0.55
2g
3.93Tesla/m
1.036L
0.35mm
0.246%
0.909m/N
168.375
FF105WK
100mm/4.0”
107mm/4.3”
93mm/3.7”
52.8mm/3.0”
20mm/0.8”
Stamped
ї
fs ~ 25kHz
88dB/W(m)
10W
30W
340g/0.750lb
800g/1.764lb
40mm
80mm
0.005m
2
ї
75Hz
ї
0.041mH
4.203
0.463
0.41
3.4g
4.823Tesla/m
4.848L
1.7mm
0.42%
1.346m/N
161.987
FF125WK
120mm/4.8”
117mm/4.7”
104mm/4.1”
61.3mm/3.0”
25mm/1.0”
Stamped
ї
fs ~ 22kHz
89dB/W(m)
16W
50W
388g/0.855lb
920g/2.028lb
46mm
92mm
0.0066m
2
ї
67Hz
ї
0.044mH
5.091
0.464
0.42
5g
5.596Tesla/m
7.265L
1.65mm
0.451%
1.153m/N
144.397
FF165WK
160mm/6.3”
166mm/6.6”
146mm/5.8”
76.6mm/4.0”
35mm/1.4”
Stamped
ї
fs ~ 21kHz
92dB/W(1m)
30W
90W
848g/1.869lb
1,950g/4.299lb
65mm
130mm
0.0132m
2
ї
50Hz
ї
0.056mH
4.19
0.373
0.34
9.5g
7.227Tesla/m
27.838L
1.85mm
0.908%
1.068m/N
134.048
FF225WK
200mm/7.9”
208mm/8.2”
185mm/7.3”
91.7mm/4.0”
50mm/2.0”
Stamped
ї
fs ~ 17kHz
93dB/W(1m)
34W
100W
1,067g/2.352lb
3,520g/7.760lb
84mm
168mm
0.022m
2
ї
44Hz
ї
0.068mH
2.31
0.409
0.35
18.4g
8.488Tesla/m
57.898L
2.25mm
0.995%
0.826m/N
107.579
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