Instruction manual and user guide for
Yamaha YST-FSW150

YST-FSW150/
YST-FSW050

SUBWOOFER SYSTEM
ENCEINTE A CAISSON DE GRAVE

G

OWNER’S MANUAL

MODE D’EMPLOI

BEDIENUNGSANLEITUNG

BRUKSANVISNING

MANUALE DI ISTRUZIONI

MANUAL DE INSTRUCCIONES

GEBRUIKSAANWIJZING

ИНСТРУКЦИЯ ПО ЭКСПЛУАТАЦИИ

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Thank you for selecting this Yamaha subwoofer system.

Please read the following operating precautions before use.
Yamaha will not be held responsible for any damage and/or injury
caused by not following the cautions below.
1

To assure the finest performance, please read this manual
carefully. Keep it in a safe place for future reference.

2

Install this unit in a cool, dry, clean place - away from
windows, heat sources, sources of excessive vibration, dust,
moisture and cold. Avoid sources of humming (transformers,
motors).

3

Never open the cabinet. If something drops into the set, contact
your dealer.

4

The voltage to be used must be the same as that specified on
the rear panel. Using this unit with a higher voltage than
specified is dangerous and may cause a fire and/or electric
shock.

5

To reduce the risk or fire or electric shock, do not expose this
unit to rain or moisture.

6

Do not use force on switches, controls or connection wires.
When moving the unit, first disconnect the power plug and the
wires connected to other equipments. Never pull the wires
themselves.

7

When not planning to use this unit for a long period (i.e.,
vacation, etc.), disconnect the AC power plug from the wall
outlet.

8

Since this unit has a built-in power amplifier, heat will radiate
from the bottom panel. Place the unit apart from the walls to
prevent fire or damage. Allow ventilation space of at least 10
cm on the top, 20 cm on the left and right, and 20 cm on the
back of this unit.

9

Do not cover this unit with a newspaper, a tablecloth, a curtain,
etc. in order not to obstruct heat radiation. If the temperature
inside the unit rises, it may cause fire, damage to the unit and/
or personal injury.

10 Do not place the following objects on this unit:

- Glass, china, small metallic etc.

If glass etc. falls by vibrations and breaks, it may cause bodily
injury.

- A burning candle etc.

If the candle falls by vibrations, it may cause fire and bodily
injury.

- A vessel with water in it

If the vessel falls by vibrations and water spills, it may cause
damage to the speaker, and/or you may get an electric shock.

11 Do not place this unit where foreign objects such as water drips

might fall. It might cause a fire, damage to this unit, and/or
personal injury.

12 Never put a hand or a foreign object into the YST port located

on the front side of this unit. When moving this unit, do not
hold the port as it might cause personal injury and/or damage
to this unit.

13 Never place a fragile object near the YST port of this unit. If

the object falls or drops by the air pressure, it may cause
damage to the unit and/or personal injury.

14 Never open the cabinet. It might cause an electric shock since

this unit uses a high voltage. It might also cause personal injury
and/or damage to this unit.

15 When using a humidifier, be sure to avoid condensation inside

this unit by allowing enough spaces around this unit or
avoiding excess humidification. Condensation might cause a
fire, damage to this unit, and/or electric shock.

16 Super-bass frequencies reproduced by this unit may cause a

turntable to generate a howling sound. In such a case, move
this unit away from the turntable.

17 This unit may be damaged if certain sounds are continuously

output at high volume level. For example, if 20 Hz-50 Hz sine
waves from a test disc, bass sounds from electronic
instruments, etc. are continuously output, or when the stylus of
a turntable touches the surface of a disc, reduce the volume
level to prevent this unit from being damaged.

18 If you hear distorted noise (i.e., unnatural, intermittent

“rapping” or “hammering” sounds) coming from this unit,
reduce the volume level. Extremely loud playing of a movie
soundtrack’s low frequency, bass-heavy sounds or similarly
loud popular music passages can damage this speaker system.

19 Vibration generated by super-bass frequencies may distort

images on a TV. In such a case, move this unit away from the
TV set.

20 Do not attempt to clean this unit with chemical solvents as this

might damage the finish. Use a clean, dry cloth.

21 Be sure to read the “Troubleshooting” section regarding

common operating errors before concluding that the unit is
faulty.

22 Install this unit near the wall outlet and where the AC power

plug can be reached easily.

23 VOLTAGE SELECTOR

(For Asia and General models)
The voltage selector switch on the bottom panel of this unit
must be set for your local main voltage BEFORE plugging this
unit into the AC main supply. Voltages are:

110–120/220–240 V AC, 50/60 Hz.

24 Secure placement or installation is the owner’s

responsibility. Yamaha shall not be liable for any accident
caused by improper placement or installation of speakers.

CAUTION: Read this before operating your unit.

This unit features a magnetically shielded design, but
there is still a chance that placing it too close to a TV set
might impair picture color. Should this happen, move
this unit away from the TV set.

This unit is not disconnected from the AC power source
as long as it is connected to the wall outlet, even if this
unit itself is turned off. In this state, this unit is designed
to consume a very small quantity of power.

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Table of contents

CAUTION: Read this before operating your unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i

Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Using the subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Advanced Yamaha Active Servo Technology II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Limited Guarantee for European Economic Area (EEA) and Switzerland . . . . . . . . . . . . . 9

Getting started

Features

• This subwoofer system employs Advanced

Yamaha Active Servo Technology II, which
Yamaha has developed to reproduce higher
quality super-bass sound (see “Advanced
Yamaha Active Servo Technology II” on page 6
for details). This super-bass sound adds a more
realistic, theater-in-the-home effect to your
stereo system.

• Yamaha’s unique and compact design let you

place this unit horizontally.

Supplied accessories

Please confirm that the following items are
included in the package.

Subwoofer cable (5 m)

System control cable (5 m)

Non-skid pad

(1 set, 4 pieces)

Stand (YST-FSW150 only)

Screw

(M4, 16 mm) x 2

(YST-FSW150 only)

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Placement

The following illustrations are the setting images
of this unit.

Example 1: Using this unit with Yamaha

Digital Sound Projector

Example 2: As a part of multi channel

speaker system

Notes

• Do not place this unit on/under any other components

in a pile. The vibration of this unit may cause system
failure, etc. in other components.

• Keep enough ventilation space on the front, the rear,

and the bottom side (that attached legs) of this unit.
Do not place this unit on a thick carpet etc.

y

Tip

You can also place this unit vertically.
When you want to do so, fix a stand using the supplied
screws (YST-FSW150 only) and then attach pads as
shown below.

y

Tip

You can also place this unit in a TV rack etc.

Note

If vibrations of this unit cause abnormal noise or
sympathetic vibrations on nearby components, attach the
supplied non-skid pads to the bottoms of the legs.

This unit

Yamaha Digital Sound Projector

This unit

YST-FSW150

YST-FSW050

Leg

Non-skid

pads

Bottom view
(example: YST-FSW150)

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Connections

Caution: Do not plug the power cables of the subwoofer and other audio/video components
into an AC outlet until you complete all the other connections

.

Basic connection example

Connect the subwoofer cable to the output jack of your AV amplifier, receiver or TV and to the

INPUT

jack

of the subwoofer.

SYSTEM

CONNECTOR

INPUT

INPUT

SYSTEM

CONNECTOR

INPUT

YST-FSW150 rear panel

Amplifier (example)

YST-FSW050 rear panel

SYSTEM

CONNECTOR

INPUT

INPUT

SYSTEM

CONNECTOR

SUBWOOFER

INPUT

SUBWOOFER

Flat TV (example)

YST-FSW150
rear panel

YST-FSW050 rear panel

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Connecting the components and the
subwoofer to the AC power

After you complete a subwoofer connection, plug
the amplifier, TV and/or other audio/video
components, and the subwoofer into an AC outlet
of appropriate voltage.

VOLTAGE SELECTOR

(For Asia and General models only)
The voltage selector switch on the bottom panel of this
unit must be set for your local main voltage BEFORE
plugging this unit into the AC main supply.
Voltages are 110–120/220–240 V AC, 50/60 Hz.

The system connection

This unit has a SYSTEM CONNECTOR jack.
Use the supplied system control cable when
connecting a Yamaha component equipped
with a system connector jack. When
connected, the power mode (

ON

,

OFF/

SYSTEM

) of this unit can be controlled with

the power button of the connected Yamaha
component.

Notes

• Set the

POWER

button of this unit to

OFF/

SYSTEM

. The power of this unit can be turned

on even when the

POWER

button is set to

OFF/SYSTEM

.

• When the

POWER

button of this unit is set to

ON

, the connected component will not control

the power mode of this unit, even though they
are connected via a system connection. The
power mode of this unit will always be

ON

.

• When this unit does not output low frequency

signals even if you use the system connection,
you need to change the setting of the connected
component. For details, refer to the manual of
the component.

SYSTEM

CONNECTOR

INPUT

INPUT

SYSTEM

CONNECTOR

SYSTEM

CONNECTOR

SYSTEM

CONNECTOR

Yamaha Digital Sound Projector (example)

YST-FSW150 rear panel

YST-FSW050 rear panel

INPUT

SYSTEM

CONNECTOR

SYSTEM

CONNECTOR

INPUT

To AC outlet

To AC outlet

YST-FSW150 rear panel

YST-FSW050 rear panel

VOLTAGE

SELECTOR

220V-240V

110V-120V

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Using the subwoofer

1 Power indicator

Lights up green while the unit is turned on.

2 POWER button

Press this button to the

ON

position to turn on

the power of the subwoofer. Press this button to
the

OFF/SYSTEM

position to turn off the

power of the subwoofer or to use the system
connection (see page 4).

3 VOLUME control

Adjusts the volume level. Turn the control
clockwise to increase the volume, and
counterclockwise to decrease the volume.

4 SYSTEM CONNECTOR terminal

Used for system connection. See “The system
connection” on page 4 for details.

5 INPUT terminal

Input terminal for line level signals from the
amplifier.

Pre-adjusting the subwoofer
volume

Before you use the subwoofer, first adjust the
volume balance between the subwoofer and the
front speakers according to the procedure below.

1.

Set the VOLUME control to minimum (0).

2.

Turn on the power of all the other
components.

3.

Press the POWER button to the ON
position.
Turn on the power switch of the connected
component when the subwoofer is
connected using the system connection.

4.

Play a source that contains low-frequency
sounds. Adjust the amplifier’s volume
control to the desired level.

5.

Increase the volume gradually to adjust the
volume balance between the subwoofer
and the front speakers.

To enjoy natural bass sound, keep the subwoofer
volume at a level where it is barely
distinguishable from other speakers.

6.

Adjust the volume of the entire sound
system using the amplifier’s volume control.

y

Tip

It is recommended to set the

VOLUME

control

about in the middle position when using in a multi
channel home theater system.

POWER

OFF/SYSTEM

ON

0

10

VOLUME

POWER

OFF/SYSTEM

ON

0

10

VOLUME

1 2

3

POWER

OFF/SYSTEM

ON

0

10

VOLUME

INPUT

SYSTEM

CONNECTOR

SYSTEM

CONNECTOR

INPUT

SYSTEM

CONNECTOR

5

INPUT

4

YST-FSW150
front panel

YST-FSW050
front panel

YST-FSW150
rear panel

YST-FSW050
rear panel

0

10

VOLUME

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Advanced Yamaha Active Servo Technology II

In 1998, Yamaha brought to the marketplace
speaker systems utilizing YST (Yamaha Active
Servo Technology) to give powerful, high quality
bass reproduction. This technique uses a direct
connection between the amplifier and speaker,
allowing accurate signal transmission and precise
speaker control.

As this technology uses speaker units controlled by
the negative impedance drive of the amplifier and
resonance generated between the speaker cabinet
volume and port, it creates more resonant energy
(the “air woofer” concept) than the standard bass

reflex method. This allows for bass reproduction
from much smaller cabinets than was previously
possible.
Yamaha’s newly developed Advanced YST II, with
many refinements to Yamaha Active Servo
Technology, allows better control of the forces
driving the amplifier and speakers. From the
amplifier’s point of view, the speaker impedance
changes depending on the sound frequency.
Yamaha developed a new circuit design combining
negative-impedance and constant-current drives,
which provides a more stable performance and
clear bass reproduction with less murkiness.

High-amplitude
bass sound

Cabinet

Port

Air woofer
(Helmholtz resonator)

Advanced
impedance
Converter

Active Servo Processing
Amplifier

Signals of low

amplitude

Signals

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Troubleshooting

Refer to the chart below if the unit does not function properly. If the problem you are experiencing is not
listed, or if the instructions fail to help you resolve the problem, disconnect the power cable and contact your
authorized Yamaha dealer or service center.

Problem

Cause

Remedy

Power is not supplied even though
the POWER button is set to the ON
position.

The power plug is not securely connected.

Turn the

POWER

button to

OFF/

SYSTEM

, and then connect the power

plug securely.

No sound.

The

VOLUME

control is set to (0).

Turn up the volume.

A subwoofer cable is not connected
securely.

Connect a subwoofer cable securely.

Sound level is too low.

You are playing a sound source that
includes inadequate bass frequencies.

Play a sound source that includes more
bass frequencies.

The sound level has been diminished by
standing waves.

Reposition the subwoofer, or break up the
parallel wall surface by placing
bookshelves or other large objects along
the wall.

The input signal is too small.

Turn up the volume.

No signal from the subwoofer output
terminal of the component.

Check the speaker mode setting on the
component.

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Specifications

Type ....... Advanced Yamaha Active Servo Technology II

Driver ..............................................16 cm (6-5/16”)

Magnetically shielded type

Output Power

YST-FSW150 ................. 75 W (5

Ω,

10% T.H.D.)

YST-FSW050 ................. 50 W (5

Ω,

10% T.H.D.)

Dynamic Power

YST-FSW150 .................................... 130 W, 5

Ω

YST-FSW050 .................................... 100 W, 5

Ω

Input Impedance ...............................................12 k

Ω

Frequency Response

YST-FSW150 ............................. 30 Hz – 160 Hz
YST-FSW050 ............................. 35 Hz – 160 Hz

Input Sensitivity

YST-FSW150 ............ 100 mV (50 Hz, 75 W/5

Ω

)

YST-FSW050 .............. 50 mV (50 Hz, 50 W/5

Ω

)

Power Supply

[U.S.A. and Canada models]..... AC 120 V, 60 Hz
[Australia model] ....................... AC 240 V, 50 Hz
[China model]............................ AC 220 V, 50 Hz
[Korea model]............................ AC 220 V, 60 Hz
[U.K. and Europe models] ......... AC 230 V, 50 Hz
[Asia and General models]

...................... AC 110–120/220–240 V, 50/60 Hz

Power Consumption

YST-FSW150 ..............................................70 W
YST-FSW050 ..............................................40 W

Dimensions (W x H x D)

YST-FSW150 ........435 mm x 151 mm x 350 mm

(17-2/16 in x 5-15/16 in x 13-12/16 in)

YST-FSW050 ........350 mm x 163 mm x 350 mm

(13-12/16 in x 6-7/16 in x 13-12/16 in)

Weight

YST-FSW150 ....................9.4 kg (20 lbs. 12 oz.)
YST-FSW050 ....................8.5 kg (18 lbs. 12 oz.)

Specifications are subject to change without notice.

Frequency characteristics

*This diagram does not depict actual frequency

response characteristics accurately.

This symbol mark is according to the
EU directive 2002/96/EC.

This symbol mark means that electrical
and electronic equipment, at their end-
of-life, should be disposed of separately
from your household waste.
Please act according to your local rules
and do not dispose of your old products
with your normal household waste.

20

50

100

200

500 Hz

40

50

60

70

80

90

100 dB

Frequency response graph*

YST-FSW150

20

50

100

200

500 Hz

40

50

60

70

80

90

100 dB

Frequency response graph*

YST-FSW050