I
YST-SW320
Active Servo Processing Subwoofer System
Caisson de grave avec asservissement actif
OWNER’S MANUAL
MODE D’EMPLOI
U C A
II
• Explanation of Graphical Symbols
The lightning flash with arrowhead
symbol, within an equilateral triangle,
is intended to alert you to the
presence of uninsulated “dangerous
voltage” within the product’s
enclosure 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
you to the presence of important
operating and maintenance
(servicing) instructions in the
literature accompanying the
appliance.
SAFETY INSTRUCTIONS
1 Read Instructions – All the safety and operating
instructions should be read before the unit is operated.
2 Retain Instructions – The safety and operating
instructions should be retained for future reference.
3 Heed Warnings – All warnings on the unit and in the
operating instructions should be adhered to.
4 Follow Instructions – All operating and other
instructions should be followed.
5 Water and Moisture – The unit should not be used near
water – for example, near a bathtub, washbowl, kitchen
sink, laundry tub, in a wet basement, or near a
swimming pool, etc.
6 Carts and Stands – The unit should be used only with
a cart or stand that is recommended by the
manufacturer.
6A A unit and cart combination should be
moved with care. Quick stops, excessive
force, and uneven surfaces may cause
the unit and cart combination to overturn.
7 Wall or Ceiling Mounting – The unit should be mounted
to a wall or ceiling only as recommended by the
manufacturer.
8 Ventilation – The unit should be situated so that its
location or position does not interfere with its proper
ventilation. For example, the unit should not be
situated on a bed, sofa, rug, or similar surface, that
may block the ventilation openings; or placed in a built-
in installation, such as a bookcase or cabinet that may
impede the flow of air through the ventilation openings.
9 Heat – The unit should be situated away from heat
sources such as radiators, stoves, or other appliances
that produce heat.
10 Power Sources – The unit should be connected to a
power supply only of the type described in the
operating instructions or as marked on the unit.
11 Power-Cord Protection – Power-supply cords should
be routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience
receptacles, and the point where they exit from the
unit.
12 Cleaning – The unit should be cleaned only as
recommended by the manufacturer.
13 Nonuse Periods – The power cord of the unit should be
unplugged from the outlet when left unused for a long
period of time.
14 Object and Liquid Entry – Care should be taken so that
objects do not fall into and liquids are not spilled into
the inside of the unit.
15 Damage Requiring Service – The unit should be
serviced by qualified service personnel when:
A. The power-supply cord or the plug has been
damaged; or
B. Objects have fallen, or liquid has been spilled into
the unit; or
C. The unit has been exposed to rain; or
D. The unit does not appear to operate normally or
exhibits a marked change in performance; or
E. The unit has been dropped, or the cabinet
damaged.
16 Servicing – The user should not attempt to service the
unit beyond those means described in the operating
instructions. All other servicing should be referred to
qualified service personnel.
17 Power Lines – An outdoor antenna should be located
away from power lines.
18 Grounding or Polarization – Precautions should be
taken so that the grounding or polarization is not
defeated.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN
OR MOISTURE.
CAUTION
CAUTION: TO REDUCE THE RISK OF
ELECTRIC SHOCK, DO NOT REMOVE
COVER (OR BACK). NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
IMPORTANT
Please record the serial number of this system in the
space below.
Model:
Serial No.:
The serial number is located on the rear of the main
unit.
Retain this Owner’s Manual in a safe place for future
reference.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
III
We Want You Listening For A Lifetime
YAMAHA and the Electronic Industries Association’s
Consumer Electronics Group want you to get the most out
of your equipment by playing it at a safe level. One that lets
the sound come through loud and clear without annoying
blaring or distortion – and, most importantly, without
affecting your sensitive hearing.
Since hearing damage from loud sounds is
often undetectable until it is too late, YAMAHA
and the Electronic Industries Association’s
Consumer Electronics Group recommend you
to avoid prolonged exposure from excessive
volume levels.
FCC INFORMATION (for US customers only)
1. IMPORTANT NOTICE : DO NOT MODIFY THIS
UNIT!
This product, when installed as indicated in the
instructions contained in this manual, meets FCC
requirements. Modifications not expressly approved
by Yamaha may void your authority, granted by the
FCC, to use the product.
2. IMPORTANT : When connecting this product to
accessories and/or another product use only high
quality shielded cables. Cable/s supplied with this
product MUST be used. Follow all installation
instructions. Failure to follow instructions could void
your FCC authorization to use this product in the
USA.
3. NOTE : This product has been tested and found to
comply with the requirements listed in FCC
Regulations, Part 15 for Class “B” digital devices.
Compliance with these requirements provides a
reasonable level of assurance that your use of this
product in a residential environment will not result in
harmful interference with other electronic devices.
This equipment generates/uses radio frequencies
and, if not installed and used according to the
instructions found in the users manual, may cause
interference harmful to the operation of other
electronic devices.
Compliance with FCC regulations does not guarantee that
interference will not occur in all installations. If this
product is found to be the source of interference, which
can be determined by turning the unit “OFF” and “ON”,
please try to eliminate the problem by using one of the
following measures:
Relocate either this product or the device that is being
affected by the interference.
Utilize power outlets that are on different branch (circuit
breaker or fuse) circuits or install AC line filter/s.
In the case of radio or TV interference, relocate/reorient
the antenna. If the antenna lead-in is 300 ohm ribbon
lead, change the lead-in to coaxial type cable.
If these corrective measures do not produce satisfactory
results, please contact the local retailer authorized to
distribute this type of product. If you can not locate the
appropriate retailer, please contact Yamaha Electronics
Corp., U.S.A. 6660 Orangethorpe Ave, Buena Park, CA
90620.
The above statements apply ONLY to those products
distributed by Yamaha Corporation of America or its
subsidiaries.
For Canadian Customers
To prevent electric shock, match wide blade of plug to
wide slot and fully insert.
This Class B digital apparatus complies with Canadian
ICES-003.
IV
Nonskid pads
Patins anti-dérapages
UNPACKING After unpacking, check that the following item is contained.
DEBALLAGE Après le déballage, vérifier que la pièce suivante est incluse.
English
E-1
● To assure the finest performance, please read this
manual carefully. Keep it in a safe place for future
reference.
● 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). To prevent fire or electrical
shock, do not expose this unit to rain or water.
● Never open the cabinet. If something drops into the set,
contact your dealer.
● To reduce the risk or fire or electric shock, do not expose
this unit to rain or moisture.
● 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.
● When not planning to use this unit for a long period (ie.,
vacation, etc.), disconnect the AC power plug from the
wall outlet.
● To prevent lightning damage, disconnect the AC power
plug when there is an electric storm.
● Since this unit has a built-in power amplifier, heat will
radiate from the rear panel. Place the unit apart from the
walls, allowing enough spaces above, behind and on
both sides of the unit to prevent fire or damage.
Furthermore, do not position with the rear panel facing
down on the floor or other surfaces.
<For U.K., Europe and China models only>
Be sure to allow spaces of at least 20 cm above, behind
and on both sides of the unit.
● Do not cover the rear panel of 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.
● Do not place the following objects on this unit:
Glass, china, etc.
If glass etc. falls by vibrations and breaks, it may cause
personal injury.
A burning candle etc.
If the candle falls by vibrations, it may cause fire and
personal injury.
A vessel with water in it
If the vessel falls by vibrations and water spills, it may
cause damage to the unit, and/or you may get an
electric shock.
● 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.
● 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.
● Vibration generated by super-bass frequencies may
distort images on a TV. In such a case, move this unit
away from the TV set.
● Do not attempt to clean this unit with chemical solvents
as this might damage the finish. Use a clean, dry cloth.
● Be sure to read the “TROUBLESHOOTING” section
regarding common operating errors before concluding
that the unit is faulty.
● 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.
● VOLTAGE SELECTOR
(China and General models only)
The voltage selector switch
on the rear 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.
For U.K. customers
If the socket outlets in the home are not suitable for the plug
supplied with this appliance, it should be cut off and an
appropriate 3 pin plug fitted. For details, refer to the
instructions described below.
Note: The plug severed from the mains lead must be
destroyed, as a plug with bared flexible cord is hazardous if
engaged in a live socket outlet.
SPECIAL INSTRUCTIONS FOR U.K. MODEL
IMPORTANT:
THE WIRES IN MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
Blue: NEUTRAL
Brown: LIVE
As the colours of the wires in the mains lead of this
apparatus may not correspond with the coloured
markings identifying the terminals in your plug, proceed
as follows: The wire which is coloured BLUE must be
connected to the terminal which is marked with the letter
N or coloured BLACK. The wire which is coloured
BROWN must be connected to the terminal which is
marked with the letter L or coloured RED. Making sure
that neither core is connected to the earth terminal of the
three pin plug.
Standby mode
When this unit is turned off by pressing the STANDBY/ON
button on the front panel, this unit consumes a small
amount of power. This state is called the standby mode.
This unit’s power supply is completely cut off from the AC
line only when the POWER switch on the rear panel is set
in the OFF position or the AC power cord is disconnected.
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.
CAUTION: Read this before operating your unit.
Thank you for selecting this YAMAHA Subwoofer System.
240V
VOLTAGE
SELECTOR
E-2
CONTENTS
UNPACKING ................ Inside of Front Cover
CAUTION .................................................. 1
FEATURES ............................................... 2
PLACEMENT ............................................ 3
CONNECTIONS....................................... 4
Connecting to line output (pin jack)
terminals of the amplifier ....................... 4
Connecting to speaker output terminals
of the amplifier ....................................... 6
CONTROLS AND THEIR FUNCTIONS ... 8
AUTOMATIC POWER-SWITCHING
FUNCTION............................................... 9
ADJUSTING THE SUBWOOFER
BEFORE USE ........................................ 10
Frequency characteristics.................... 11
ADVANCED YAMAHA ACTIVE SERVO
TECHNOLOGY ...................................... 12
TROUBLESHOOTING ........................... 13
SPECIFICATIONS ................................. 14
FEATURES
● This subwoofer system employs Advanced
YAMAHA Active Servo Technology which YAMAHA
has developed for reproducing higher quality
super-bass sound. (Refer to page 12 for details on
Advanced YAMAHA Active Servo Technology.) This
super-bass sound adds a more realistic, theater-in-
the-home effect to your stereo system.
● This subwoofer can be easily added to your
existing audio system by connecting to either the
speaker terminals or the line output (pin jack)
terminals of the amplifier.
● For the effective use of this unit, this unit’s super-
bass sound should be matched to the sounds of
your main speakers. You can create the best sound
quality for various listening conditions by using the
HIGH CUT control and the PHASE switch.
● The Automatic power-switching function saves you
the trouble of pressing the STANDBY/ON button to
turn the power on and off.
● You can select bass effect suitable for the source
by using the BASS switch.
QD-Bass Technology
QD-Bass (Quatre Dispersion Bass) technology uses
square, pyramid-shaped reflective plates to radiate the
sound in four horizontal directions.
SW320ENG(02.7.4)a 02.7.17, 4:04 PM2
English
E-3
PLACEMENT
One subwoofer will have a good effect on your audio
system, however, the use of two subwoofers is
recommended to obtain more effect.
If using one subwoofer, it is recommended to place it on the
outside of either the right or the left main speaker. (See fig.
Å.) If using two subwoofers, it is recommended to place
them on the outside of each main speaker. (See fig. ı.) The
placement shown in fig. Ç is also possible, however, if the
subwoofer system is placed directly facing the wall, the
bass effect may die because the sound from it and the
sound reflected by the wall may cancel out each other. To
prevent this from happening, face the subwoofer system at
an angle as in fig. Å or ı.
Note
There may be a case that you cannot obtain enough super-bass
sounds from the subwoofer when listening in the center of the
room. This is because “standing waves” have been developed
between two parallel walls and they cancel the bass sounds.
In such a case, face the subwoofer obliquely to the wall. It also
may be necessary to break up the parallel surfaces by placing
bookshelves etc. along the walls.
( : subwoofer, : main speaker)
Use the nonskid pads
Put the provided nonskid pads at the four corners on the
bottom of the subwoofer to prevent the subwoofer from
moving by vibrations etc.
Çı
Å
E-4
SPLIT SUBWOOFER
SUBWOOFER
(LOW PASS)
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
OUTPUT
TO SPEAKERS
/MONO
INPUT
1
INPUT
2
FROM AMPLIFIER
/MONO
CONNECTIONS
Caution: Plug in the subwoofer and other audio/video components after all connections are
completed.
● All connections must be correct, that is to say L (left) to L, R (right) to R, “+” to “+” and “–” to “–”. Also refer to the owner’s
manual for each of your components.
● <China and General models only>
Set the VOLTAGE SELECTOR switch to the proper voltage of your area BEFORE plugging in the subwoofer.
● The subwoofer can be connected to either the line output (pin jack) terminals or the speaker output terminals of the amplifier.
Choose one of the ways shown in this section that is more suitable for your audio system. Also, refer to the owner’s manual
of your component to be connected to the subwoofer.
Basically, connect the subwoofer to the line output (pin jack) terminal(s) of the amplifier. (Refer to pages 4 and 5 for details.)
If your amplifier does not have any line output terminal, connect the subwoofer to the speaker output terminals of the
amplifier. (Refer to pages 6 and 7 for details.)
Subwoofer
Amplifier
To AC outlet
● To connect with a YAMAHA DSP amplifier (or AV
receiver), connect the SUBWOOFER (or LOW PASS etc.)
terminal on the rear of the DSP amplifier (or AV receiver)
to the L/MONO INPUT2 terminal of the subwoofer.
Connect the main speakers to the speaker output terminals of the amplifier.
● When connecting the subwoofer to the SPLIT
SUBWOOFER terminals on the rear of the DSP amplifier,
be sure to connect the L/MONO INPUT2 terminal to the
“L” side and the R INPUT2 terminal to the “R” side of the
SPLIT SUBWOOFER terminals.
Pin plug cord
(not included)
Connecting to line output (pin jack) terminals of the amplifier
m Using one subwoofer
Left main speaker
Right main speaker
English
E-5
SPLIT SUBWOOFER
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
/MONO /MONO
/MONO
/MONO
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
m Using two subwoofers
Notes
● Some amplifiers have line output terminals labeled PRE OUT.
When you connect the subwoofer to the PRE OUT terminals of
the amplifier, make sure that the amplifier has at least two sets
of PRE OUT terminals. If the amplifier has only one set of
PRE OUT terminals, do not connect the subwoofer to the PRE
OUT terminals. Instead, connect the subwoofer to the speaker
output terminals of the amplifier. (Refer to pages 6 and 7.)
● When connecting to a monaural line output terminal of the
amplifier, connect the L/MONO INPUT2 terminal.
● When connecting to line output terminals of the amplifier,
other speakers should not be connected to the OUTPUT
terminals on the rear panel of the subwoofer. If connected,
they will not produce sound.
Subwoofer
Amplifier
To AC outlet
Pin plug cords
(not included)
Left main speaker
Right main speaker
Subwoofer
To AC outlet
E-6
AB
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
/MONO
/MONO
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
/MONO
/MONO
Connecting to speaker output terminals of the amplifier
m Using one subwoofer
If your amplifier has only one set of main speaker output terminals
Connect the speaker output terminals of the amplifier to the INPUT1 terminals of the subwoofer, and connect the OUTPUT
terminals of the subwoofer to the main speakers.
Left main speakerRight main speaker
Subwoofer
Amplifier
Speaker output
terminals
To AC outlet
If your amplifier has two sets of speaker output terminals
(Both A and B speaker outputs must be ON.)
Left main speakerRight main speaker
Subwoofer
Amplifier
Speaker output
terminals
To AC outlet
English
E-7
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
/MONO
/MONO
/MONO
/MONO
m Using two subwoofers
Connect the speaker output terminals of the amplifier to the INPUT1 terminals of the subwoofer, and connect the OUTPUT
terminals of the subwoofer to the main speakers.
Left main speakerRight main speaker
Subwoofer
Speaker output
terminals
To AC outlet
Subwoofer
To AC outlet
Amplifier
For connections, keep the speaker cords as short as
possible. Do not bundle or roll up the excess part of the
cords. If the connections are faulty, no sound will be heard
from the subwoofer or the speakers, or both of them. Make
sure that the + and – polarity markings of the speaker cords
are observed and set correctly. If these cords are reversed,
the sound will be unnatural and lack bass.
How to Connect:
Red: positive (+)
Black: negative (–)
1 Loosen the knob.
2 Insert the bare wire.
[Remove approx.
10 mm (3/8”)
insulation from the
speaker wires.]
3 Tighten the knob
and secure the wire.
Caution
Do not let the bare speaker wires touch each other as
this could damage the subwoofer or the amplifier, or
both of them.
<U.S.A., Canada, Australia, China and General models
only>
Banana Plug connections are also possible.
1 Tighten the terminal knob.
2 Simply insert the Banana Plug connector into the
terminal.
Connecting to the INPUT1/OUTPUT terminals of the subwoofer
1
2
3
1
2
E-8
SUBWOOFER SYSTEM YST–SW320
STANDBY/ON VOLUME0
–
10HIGH CUT40
–
140Hz
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
VOLTAGE
SELECTOR
STANDBY/ON VOLUME0
–
10HIGH CUT40
–
140Hz
1 2 3 4
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
7 A8 9
B
/MONO
/MONO
0
ON
POWER
OFF
VOLTAGE
SELECTOR
65
1 Power indicator
Lights up while the subwoofer is turned on.
2 STANDBY/ON button
Press this button to turn on the power. Press again to
set the subwoofer in the standby mode.
* This button can be used only when the POWER (5)
switch is set in the ON position.
Standby mode
The subwoofer is still using a small amount of power
in this mode.
3 HIGH CUT control
Adjusts the high frequency cut off point.
Frequencies higher than the frequency selected by this
control are all cut off (and no output).
* One graduation of this control represents 10 Hz.
4 VOLUME control
Adjusts the volume level. Turn the control clockwise to
increase the volume, and counterclockwise to
decrease the volume.
5 POWER switch
Normally, set this switch to the ON position to use the
subwoofer. In this state, you can turn on the subwoofer
or turn the subwoofer into the standby mode by
pressing the STANDBY/ON (2) button. Set this
switch to the OFF position to completely cut off the
subwoofer’s power supply from the AC line.
6 VOLTAGE SELECTOR switch
(China and General models only)
If the preset setting of the switch is incorrect, set the
switch to the proper voltage (110V, 120V, 220V or
240V) of your area.
Consult your dealer if you are unsure of the correct
setting.
WARNING
Be sure to unplug the subwoofer before setting the
VOLTAGE SELECTOR switch correctly.
Rear panel
CONTROLS AND THEIR FUNCTIONS
40Hz
50Hz
60Hz 120Hz
70Hz 110Hz
80Hz 100Hz
90Hz
130Hz
140Hz
Front panel
English
E-9
When you play a source, the power of the subwoofer turns
on automatically by sensing audio signals input to the
subwoofer. On the other hand, the subwoofer automatically
switches to the standby mode if the source being played is
stopped or the input signal is cut off for a few minutes.
This function operates by sensing a certain level of low
frequency input signal. Its sensitivity is high in the HIGH
position and low in the LOW position of the AUTO
STANDBY switch. Set this switch to the position you prefer.
In the HIGH position, the power will turn on even with a low
level of input signal. But please be aware that the subwoofer
may not switch to the standby mode when there is an
extremely low input signal.
* The power might turn on unexpectedly by sensing noise
from other appliances. If that occurs, set the AUTO
STANDBY switch to the OFF or LOW position.
* The level of low frequency input signal differs with each
source and among different parts within the same source.
This means that the function may not operate properly on
some sources.
This function is available only when the power of the
subwoofer is on (by setting the STANDBY/ON button to
“ON”).
7 BASS switch
By setting this switch to the MOVIE position, the bass
sound in video software is well reproduced. By setting
it to the MUSIC position, the bass sound in audio
software is well reproduced.
8 PHASE switch
Normally this switch is to be set to the REV (reverse)
position. However, according to your speaker systems
or the listening condition, there may be a case when
better sound quality is obtained by setting this switch to
the NORM (normal) position. Select the better position
by monitoring the sound.
9 AUTO STANDBY (HIGH/LOW/OFF) switch
This switch is originally set to the OFF position. By
setting this switch to the HIGH or LOW position, the
subwoofer’s automatic power-switching function
operates as described below. If you do not need this
function, leave this switch in the OFF position.
* Make sure to change the setting of this switch only when
the STANDBY/ON (2) button is in the OFF position.
0 INPUT2 terminals
Used to input line level signals from the amplifier.
(Refer to “CONNECTIONS” for details.)
A OUTPUT (TO SPEAKERS) terminals
Can be used for connecting to the main speakers.
Signals are sent directly from the amplifier to the main
speakers by way of these terminals.
(Refer to “CONNECTIONS” for details.)
B INPUT1 (FROM AMPLIFIER) terminals
Used to connect the subwoofer with the speaker
terminals of the amplifier.
(Refer to “CONNECTIONS” for details.)
AUTOMATIC POWER-SWITCHING FUNCTION
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SUBWOOFER SYSTEM YST–SW320
STANDBY/ON VOLUME0
–
10HIGH CUT40
–
140Hz
OUTPUT
TO SPEAKERS
INPUT
1
INPUT
2
FROM AMPLIFIER
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
ON
POWER
OFF
STANDBY/ON VOLUME
0
–
10
HIGH CUT
40
–
140Hz
BASS
MUSIC NORMMOVIE REV HIGH
LOW
OFF
PHASE AUTO
STANDBY
3
7
5 1, 6
/MONO
1 Set the VOLUME control to minimum (0).
2 Turn on the power of all the other
components.
3 Press the STANDBY/ON button to turn on
the subwoofer.
4 Play a source and adjust the amplifier’s
volume control to the desired listening level.
5 Adjust the HIGH CUT control to the position
where the desired response can be
obtained.
Normally, set the control to the main speaker’s rated
minimum reproducible frequency*.
* The main speaker’s rated minimum reproducible
frequency can be looked up in the speakers’ catalog
or owner’s manual.
Before using the subwoofer, adjust the subwoofer to obtain the optimum volume and tone balance between the subwoofer and
the main speakers by following the procedures described below.
6 Increase the volume gradually to adjust the
volume balance between the subwoofer and
the main speakers.
Normally, set the control to the level where you can
obtain a little more bass effect than when this unit is
not used. If the desired response cannot be obtained,
adjust the HIGH CUT control and the VOLUME
control again.
7 Set the PHASE switch to the position which
gives you the better bass sound.
Normally, set the switch to the REV (reverse) position.
If the desired response cannot be obtained, set the
switch to the NORM (normal) position.
● Once the volume balance between the subwoofer and
the main speakers is adjusted, you can adjust the
volume of your whole sound system by using the
amplifier’s volume control.
However, if you change the main speakers to others,
you must make this adjustment again.
● For adjusting the VOLUME control, the HIGH CUT
control and the PHASE switch, refer to “Frequency
characteristics” on the next page.
ADJUSTING THE SUBWOOFER BEFORE USE
Rear panel
Front panel
English
E-11
Frequency characteristics
This subwoofer’s frequency characteristics
EX.1 When combined with a 4” or 5” (10 cm or 13 cm) acoustic suspension, 2 way system main
speakers
EX.2 When combined with an 8” or 10” (20 cm or 25 cm) acoustic suspension, 2 way system main
speakers
PHASE–Set to the REV
(reverse) position.
The figures below show the optimum adjustment of each control and the frequency characteristics when this subwoofer is
combined with a typical main speaker system.
PHASE–Set to the REV
(reverse) position.
VOLUME
0
–
10
HIGH CUT
40
–
140Hz
VOLUME
0
–
10
HIGH CUT
40
–
140Hz
20 50 100 200 500 Hz
40
50
60
70
80
90
100 dB
HIGH CUT 40 Hz
HIGH CUT 90 Hz
HIGH CUT
140 Hz
20 50 100 200 500 Hz
40
50
60
70
80
90
100 dB
YST-SW320
20 50 100 200 500 Hz
40
50
60
70
80
90
100 dB
YST-SW320
Main
speaker’s
response
Main
speaker’s
response
E-12
ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY
The theory of Yamaha Active Servo Technology has been
based upon two major factors, the Helmholtz resonator and
negative-impedance drive. Active Servo Processing
speakers reproduce the bass frequencies through an “air
woofer”, which is a port or opening in the speaker’s cabinet.
This opening is used instead of, and performs the functions
of, a woofer in a conventionally designed speaker system.
Thus, signals of low amplitude within the cabinet can,
according to the Helmholtz resonance theory, be outputted
from this opening as waves of great amplitude if the size of
the opening and the volume of the cabinet are in the correct
proportion to satisfy a certain ratio.
In order to accomplish this, moreover, the amplitudes within
the cabinet must be both precise and of sufficient power
because these amplitudes must overcome the “load”
presented by the air that exists within the cabinet.
Thus it is this problem that is resolved through the
employment of a new design in which the amplifier supplies
special signals. If the electrical resistance of the voice coil
could be reduced to zero, the movement of the speaker unit
would become linear with respect to signal voltage. To
accomplish this, a special negative-impedance output-drive
amplifier for subtracting output impedance of the amplifier is
used.
By employing negative-impedance drive circuits, the
amplifier is able to generate precise, low-amplitude, low-
frequency waves with superior damping characteristics.
These waves are then radiated from the cabinet opening as
high-amplitude signals. The system can, therefore, by
employing the negative-impedance output drive amplifier
and a speaker cabinet with the Helmholtz resonator,
reproduce an extremely wide range of frequencies with
amazing sound quality and less distortion.
The features described above, then, are combined to be the
fundamental structure of the conventional Yamaha Active
Servo Technology.
Our new Active Servo Technology — Advanced Yamaha
Active Servo Technology — adopted Advanced Negative
Impedance Converter (ANIC) circuits, which allows the
conventional negative impedance converter to dynamically
vary in order to select an optimum value for speaker
impedance variation. With this new ANIC circuits, Advanced
Yamaha Active Servo Technology can provide more stable
performance and improved sound pressure compared with
the conventional Yamaha Active Servo Technology, resulting
in more natural and dynamic bass reproduction.
High-amplitude
bass sound
Cabinet
Port
Air woofer
(Helmholtz resonator)
Active Servo
Processing
Amplifier
Signals
Signals of low amplitude
Advanced Negative-
impedance Converter
English
E-13
Problem
Power is not supplied even
though the STANDBY/ON button
is set to the ON position.
No sound.
Sound level is too low.
The subwoofer does not turn on
automatically.
The subwoofer turns into the
standby mode unexpectedly.
The subwoofer turns on
unexpectedly.
What to Do
Plug the power cord into an AC outlet
and/or set the POWER switch to the ON
position.
Turn the VOLUME control to the right.
Connect them securely.
Connect them correctly, that is L (left) to
L, R (right) to R, “+” to “+” and “–” to “–”.
Set the switch to the other position.
Play a source sound with bass
frequencies.
Set the HIGH CUT control to a higher
position.
Reposition the subwoofer or break up
the parallel surface by placing
bookshelves etc. along the walls.
Set the POWER switch to the ON
position.
Set the STANDBY/ON button to ON.
Set the AUTO STANDBY switch to the
“HIGH” or “LOW” position.
Set the AUTO STANDBY switch to the
“HIGH” position.
Set the AUTO STANDBY switch to the
“HIGH” position.
Move the subwoofer farther away from
such appliances and/or reposition the
connected speaker cables.
Otherwise, set the AUTO STANDBY
switch to the “OFF” position.
Cause
The power cord is not plugged in, or the
POWER switch is set to the OFF
position.
The VOLUME control is set to 0.
Speaker cords are not connected
securely.
Speaker cords are not connected
correctly.
Setting of the PHASE switch is not
proper.
A source sound with few bass
frequencies is played.
It is influenced by standing waves.
The POWER switch is set to the OFF
position.
The STANDBY/ON button is set to OFF.
The AUTO STANDBY switch is set to
the OFF position.
The level of input signal is too low.
The level of input signal is too low.
There is an influence of noise
generated from external appliances etc.
TROUBLESHOOTING
Refer to the chart below when this unit does not function properly. If the problem you are experiencing is not listed below or if
the instructions given below do not help, disconnect the power cord and contact your authorized YAMAHA dealer or service
center.
E-14
SPECIFICATIONS
Type ............... Advanced Yamaha Active Servo Technology
Driver.............................25 cm (10”) cone woofer (JA2560)
Magnetically shielded type
Amplifier Output.................................................. 250W/5Ω
Frequency Response.................. 20 Hz–160 Hz (–10 dB)
Power Supply
USA and Canada models .......................AC 120V, 60 Hz
U.K. and Europe models ........................ AC 230V, 50 Hz
Australia model.......................................AC 240V, 50 Hz
China and General models
........................................ AC 110/120/220/240V, 50/60 Hz
Power Consumption ...................................................60W
Dimensions (W x H x D)...... 340 mm x 432 mm x 370 mm
(13-3/8” x 17” x 14-9/16”)
Weight ..................................................17 kg (37 lbs. 6 oz.)
Accessories .............................................. Nonskid pad x 4
* Please note that all specifications are subject to change
without notice.
YAMAHA ELECTRONICS CORPORATION, USA 6660 ORANGETHORPE AVE., BUENA PARK, CALIF. 90620, U.S.A.
YAMAHA CANADA MUSIC LTD. 135 MILNER AVE., SCARBOROUGH, ONTARIO M1S 3R1, CANADA
YAMAHA ELECTRONIK EUROPA G.m.b.H. SIEMENSSTR, 22-34, 25462 RELLINGEN, BEI HAMBURG, F.R. OF GERMANY
YAMAHA ELECTRONIQUE FRANCE S.A. RUE AMBROISE CROIZAT BP70 CROISSY-BEAUBOURG 77312 MARNE-LA-VALLEE CEDEX02, FRANCE
YAMAHA ELECTRONICS (UK) LTD. YAMAHA HOUSE, 200 RICKMANSWORTH ROAD WATFORD, HERTS WD1 7JS, ENGLAND
YAMAHA SCANDINAVIA A.B. J A WETTERGRENS GATA 1, BOX 30053, 400 43 VASTRA FRÖLUNDA, SWEDEN
YAMAHA MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA
V586430-2
Printed in China
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