Fostex FF225WK, FF125WK, FF85WK, FF105WK, FF165WK User Manual

PRINTED IN CHINA MARCH 2011 535483

FULL RANGE SPEAKER UNIT

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Thank& you& for& purchasing& our& product.& FF5WK& series& are& full5range& speaker& units& ideally& and& exclusively&
designed&for&a&bass5reflex&enclosure.&The&previous&FF&series&speaker&units&construction&has&thoroughly&been&rede5
signed&on&the&FF5WK&series.&With&a&new&addition&of&105cm&diameter&speaker&unit&to&the&product&range,&&new&tech5
nologies&such&as&a&“double5layer”&paper&cone,&&a&ridge5dome&shape&aluminum&alloy&center&cap&and&a&pocket&neck&
damper&have&been&employed&for&high5quality&sound.&Even&with&these&new&technologies,&FF5WK&series&inherit&the&
previous&FF&series&bright&and&realistic&sound&character,&and&achieve&a&powerful&low&sound&and&non5characterized&
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

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fs ~ 28kHz

86.5dB/W(m)
5W

15W
187g/0.412lb
450g/0.992lb

30mm
60mm

0.0028m

2

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115Hz

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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

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fs ~ 25kHz

88dB/W(m)

10W

30W
340g/0.750lb
800g/1.764lb

40mm
80mm

0.005m

2

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75Hz

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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

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fs ~ 22kHz

89dB/W(m)

16W

50W
388g/0.855lb
920g/2.028lb

46mm
92mm

0.0066m

2

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67Hz

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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

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fs ~ 21kHz

92dB/W(1m)

30W
90W

848g/1.869lb

1,950g/4.299lb

65mm

130mm

0.0132m

2

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50Hz

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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

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fs ~ 17kHz

93dB/W(1m)

34W

100W
1,067g/2.352lb
3,520g/7.760lb

84mm

168mm

0.022m

2

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44Hz

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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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EBP

40

50

60

70

80

90

100

110

100 1k 10k

64

4

8

16

32

20 50 200 500 2k 5k 20k 50kHz

(dB)

30°

60°

100 1k 10k

4

8

16

32

50 200 500 2k 5k 20k 50k

20 Hz

40

(dB)

50

60

70

80

90

100

110

64

30°

60°

100 1k 10k

4

8

16

32

50 200 500 2k 5k 20k 50k

40

20 Hz

(dB)

50

60

70

80

90

100

110

64

30°

60°

100 1k 10k

4

8

16

32

50 200 500 2k 5k 20k 50k

40

20 Hz

(dB)

50

60

70

80

90

100

110

64

30°

60°

100 1k 10k

4

8

16

32

50 200 500 2k 5k 20k 50k

40

20 Hz

(dB)

50

60

70

80

90

100

110

64

30°

60°

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B

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MODEL A B C D E F G H I J Note
FF85WK ø70

47.5 4-4 x 6** ø86 ø65 43.3 3.4 15 ø73

FF105WK ø92

54.6 4-5 x 6** ø115 ø85 48.8 4 15 ø93

FF125WK ø102.2

62.4 4-ø5* ø126 ø90 57.5 3.8 15 ø104

FF165WK ø143.6

78.5 4-ø5* ø174 ø120 72 4.6 20 ø146

FF225WK ø182

93.7 4-ø5* ø220 ø145 86.5 5.2 18 ø185

40

50

60

70

80

90

100

110

dB

100 200 50 0 1k 2 k 5 k 1 0k 20k 5 0k 100k

Hz

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FF-WK New Technology Elements

Surface Layer

(kenaf: about 2 mm of fiber length)

Basic Layer

(wooden pulp: about 4 mm of fiber length)

Surface Layer

0.697

3.608
2273

3.264

0.0258

Density (g/cm

3

)
Young’s modulus (Gpa)
Acoustic velocity (m/s)
Bending rigidity
Internal loss

Basic Layer

0.77

3.598
2158

2.8

0.0298

Pocket Neck Damper

(Shape Diagram)

Comparison on ridge / conventional dome vibration mode

Conventional dome diaphragm

shape and vibration mode

Ridge dome diaphragm

shape and vibration mode

Axis objective mode occurs.

Axis objective mode does not occur.

Comparison on ridge / conventional dome freq. response

Ridge dome

Conventional dome

Outer Shape / Baffle Hole Dimensions List

*: Circular hole, **: Slotted hole

FF85/105/125WK outer shape drawing FF165/225WK outer shape drawing Baffle hole drawing

Frequency Response

PLUS TERMINAL

PLUS TERMINAL

FF85WK FF105WK

FF125WK

FF165WK

FF225WK

IMPEDANCE

IMPEDANCE

IMPEDANCE

IMPEDANCE

IMPEDANCE