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I
YST-SW305/205
Active Servo Processing Subwoofer System
OWNER’S MANUAL
UB
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 these instructions.
2 Keep these instructions.
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.
8 Do not install near any heat sources such as radiators,
heat 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 safety. If
the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
10 Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
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.
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
13 Unplug this apparatus during lightning storms or when
unused for long periods of time.
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.
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.
IV
Nonskid pads
UNPACKING After unpacking, check that the following item is contained.
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. and Europe 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 small metallic objects on this unit. Otherwise, the
object may fall, possibly causing an 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.
● 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.
● 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.
● 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.
● 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.
● This unit may be damaged if certain sounds are continuously
outputted 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 outputted, or when the stylus of a turntable
touches the surface of a disc, reduce the volume level to prevent
this unit from being damaged.
● 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 cable
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
2
CONTENTS
SAFETY INSTRUCTIONS ....................... II
UNPACKING ........................................... IV
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 or turn it to the STANDBY mode.
• You can select bass effect suitable for the source
by using the B.A.S.S. button.
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.
( : subwoofer, : main speaker)
Çı
Å
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.
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.
4
OUTPUT
+– +–
+– +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
SPLIT SUBWOOFER
SUBWOOFER
(LOW PASS)
OUTPUT
+– +–
+– +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
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.
• 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.
Connecting to line output (pin jack) terminals of the amplifier
■ Using one subwoofer
Left main speaker
Right main speaker
*Illustration shows YST-SW205.
5
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
SPLIT SUBWOOFER
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
■ 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.
Subwoofer
Amplifier
To AC outlet
Left main speaker
Right main speaker
Subwoofer
To AC outlet
*Illustration shows YST-SW205.
6
AB
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
Connecting to speaker output terminals of the amplifier
■ 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
speaker
Right main
speaker
Subwoofer
Amplifier
Speaker output terminals
To AC outlet
*Illustration shows YST-SW205.
7
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
OUTPUT
+ – +–
+ – +–
INPUT
2
INPUT
1
TO SPEAKERS
/MONO
FROM AMPLIFIER
■ 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 cables as short as
possible. Do not bundle or roll up the excess part of the
cables. 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
cables are observed and set correctly. If these cables 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 the
insulation coating at
the extremity of
each speaker cable
by twisting the
coating off.]
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
*Illustration shows YST-SW205.
8
SUPERWOOFER SYSTEM YST-SW205
STANDBY/ B.A.S.S. HIGH CUT
40Hz
MOVIE
MUSIC
140Hz 100
VOLUME
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
VOLTAGE
SELECTOR
STANDBY/ B.A.S.S. HIGH CUT
40Hz
MOVIE
MUSIC
140Hz 100
VOLUME
ON
POWER
OFF
ON
VOLTAGE
SELECTOR
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM
REV
OFF HIGH
FROM AMPLIFIER
~ Power indicator
Lights up in green while the subwoofer is turned on.
Ÿ STANDBY/ON button
Press this button to turn on the power. (The power
indicator lights up in green.)
Press again to set the subwoofer in the standby mode.
(The power indicator does not light.)
* This button can be used only when the POWER (%)
switch is set in the ON position.
Standby mode
The subwoofer is still using a small amount of power
in this mode.
! B.A.S.S. (Bass Action Selector System) button
When this button is pressed in to the MUSIC position,
the bass sound in audio software is well reproduced.
By pressing the button again so that it pops out at the
MOVIE position, the bass sound in video software is
well reproduced.
⁄ 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.
@ VOLUME control
Adjusts the volume level. Turn the control clockwise to
increase the volume, and counterclockwise to
decrease the volume.
Rear panel
CONTROLS AND THEIR FUNCTIONS
Front panel
HIGH CUT
40Hz 140Hz
MOVIE MUSIC
*Illustration shows YST-SW205.
9
If the source being played is stopped and the input signal is
cut off for 7 to 8 minutes, the subwoofer automatically
switches to the standby mode. (When the subwoofer
switches to the standby mode by the automatic power-
switching function, the power indicator lights up in red.)
When you play a source again, the power of the subwoofer
turns on automatically by sensing audio signals input to the
subwoofer.
This function operates by sensing a certain level of low
frequency input signal. Usually set the AUTO STANDBY
switch to the LOW position. However, if the power is not
switched to ON or STANDBY smoothly, set the switch to the
HIGH position. 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 position and use the
STANDBY/ON button to switch the power between ON
and STANDBY manually.
* This function detects the low-frequency components
below 200 Hz of the input signals (i.e., the explosion in
the action movie, the sound of the bass guitar or the bass
drum, etc.).
* The minutes required to switch the subwoofer to the
standby mode might change by sensing noise from other
appliances.
This function is available only when the power of the
subwoofer is on (by pressing the STANDBY/ON button).
¤ OUTPUT (TO SPEAKERS) terminals
Can be used for connecting to the main speakers.
Signals from the INPUT1 terminals (‹) are sent to
these terminals.
(Refer to “CONNECTIONS” for details.)
# INPUT2 terminals
Used to input line level signals from the amplifier.
(Refer to “CONNECTIONS” for details.)
‹ INPUT1 (FROM AMPLIFIER) terminals
Used to connect the subwoofer with the speaker
terminals of the amplifier.
(Refer to “CONNECTIONS” for details.)
$ 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 subwoofer is in the standby mode. (The
power indicator does not light.)
AUTOMATIC POWER-SWITCHING FUNCTION
› 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.
% 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 (Ÿ) button. Set this switch
to the OFF position to completely cut off the
subwoofer’s power supply from the AC line.
fi 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.
10
SUPERWOOFER SYSTEM YST-SW205
STANDBY/ B.A.S.S. HIGH CUT
40Hz
MOVIE
MUSIC
140Hz 100
VOLUME
ON
OUTPUT
+ – +–
+ – +–
INPUT
2
AUTO
PHASE
STANDBY
INPUT
1
TO SPEAKERS
/MONO
LOW
NORM REV
OFF HIGH
FROM AMPLIFIER
POWER
OFF
ON
3
7
5
8 1, 6
STANDBY/ B.A.S.S. HIGH CUT
40Hz
MOVIE
MUSIC
140Hz 100
VOLUME
ON
PHASE
NORM
REV
1 Set the VOLUME control to minimum (0).
2 Turn on the power of all the other
components.
3 Make sure that the POWER switch is set to
the ON position, then press the STANDBY/
ON button to turn on the subwoofer.
* The power indicator lights up in green.
4 Play a source containing low-frequency
components 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.
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.
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.
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.
8 Select “MOVIE” or “MUSIC” according to the
played source.
MOVIE: When a movie type source is played, the
low-frequency effects are enhanced to allow the
listener enjoy more powerful sound. (The sound
will be thicker and deeper.)
MUSIC: When an ordinary music source is
played, the excessive low-frequency components
are cut off to make the sound clearer. (The sound
will be lighter and reproduces the melody line
more clearly.)
• 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
Front panel
Rear panel
*Illustration shows YST-SW205.
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
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.
HIGH CUT
40Hz 140Hz 100
VOLUME
HIGH CUT
40Hz 140Hz 100
VOLUME
20 50 100 200 500Hz
40
50
60
70
80
90
dB
HIGH CUT 90 Hz
HIGH CUT 140 Hz
HIGH CUT 40 Hz
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW305
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW305
Main
speaker’s
response
Main
speaker’s
response
20 50 100 200 500Hz
40
50
60
70
80
90
dB
HIGH CUT 40 Hz
HIGH CUT 140 Hz
HIGH CUT 90 Hz
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW205
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW205
YST-SW305
YST-SW205
Main
speaker’s
response
Main
speaker’s
response
HIGH CUT
40Hz 140Hz 100
VOLUME
HIGH CUT
40Hz 140Hz 100
VOLUME
YST-SW305
YST-SW205
YST-SW305
YST-SW205
Combined frequency response
* One graduation of this
control represents 10 Hz.
PHASE–Set to the REV
(reverse) position.
* One graduation of this
control represents 10 Hz.
PHASE–Set to the REV
(reverse) position.
* One graduation of this
control represents 10 Hz.
PHASE–Set to the REV
(reverse) position.
* One graduation of this
control represents 10 Hz.
PHASE–Set to the REV
(reverse) position.
Combined frequency response
Combined frequency response
Combined frequency response
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
13
What to Do
Plug the power cable 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.
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.
Cause
The power cable is not plugged in, or
the POWER switch is set to the OFF
position.
The VOLUME control is set to 0.
Speaker cables are not connected
securely.
Speaker cables 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 cable and contact your authorized YAMAHA dealer or service
center.
14
SPECIFICATIONS
Type ............... Advanced Yamaha Active Servo Technology
Driver
YST-SW305 .................................. 20 cm (8”) cone woofer,
Magnetic shielding type x 2
YST-SW205 .................................. 20 cm (8”) cone woofer,
Magnetic shielding type
Amplifier Output
YST-SW305 ......................................................... 200W/5Ω
YST-SW205 ......................................................... 150W/5Ω
Frequency Response
YST-SW305 .............................................. 20 Hz to 160 Hz
YST-SW205 .............................................. 23 Hz to 170 Hz
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
YST-SW305 ................................................................ 80W
YST-SW205 ................................................................ 70W
(In the standby mode: 0.8W)
Dimensions (W x H x D)
YST-SW305 ......................... 235 mm x 585 mm x 445 mm
(9-5/16” x 23” x 17-1/2”)
YST-SW205 ......................... 235 mm x 485 mm x 402 mm
(9-5/16” x 19-1/8” x 15-13/16”)
Weight
YST-SW305 ........................................ 21 kg (46 lbs. 5 oz.)
YST-SW205 ........................................ 15 kg (33 lbs. 1 oz.)
Accessories ............................................... Nonskid pad x 4
* Please note that all specifications are subject to change
without notice.
16
Printed in Indonesia V731310-1
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 VÄSTRA FRÖLUNDA, SWEDEN
YAMAHA MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA
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