OWNER’S MANUAL
MODE D’EMPLOI
Active Servo Processing Subwoofer System
Enceinte pour très basses fréquences de traitement à asservissement actif
YST-SW300
Active Servo
Technology
Thank you for selecting this YAMAHA Subwoofer System.
Nous vous remercions d’avoir porté votre choix sur cette enceinte
pour très basses fréquences YAMAHA.
2
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
•
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.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN
OR MOISTURE.
SAFETY INSTRUCTIONS
3
English
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.
FCC INFORMATION (for US customers only)
We Want You Listening For A Lifetime (for US customers only)
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.
4
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). To
prevent fire or electrical shock, do not expose the unit to rain or
water.
3. Never open the cabinet. If something drops into the set, contact
your dealer.
4. 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 equipment. Never pull the wire itself.
5. Do not attempt to clean the unit with chemical solvents; this might
damage the finish. Use a clean, dry cloth.
6. Be sure to read the “TROUBLESHOOTING” section regarding
common operating errors before concluding that the unit is faulty.
7. When not planning to use this unit for long periods of time (ie.,
vacation, etc.), disconnect the AC power plug from the wall outlet.
8. To prevent lightning damage, disconnect the AC power plug when
there is an electrical storm.
9. Since this unit has a built-in power amplifier, heat will radiate from
the rear panel. Therefore, place the unit apart from the walls,
allowing a space of at least 20 cm (7-7/8”) above, behind and on
the both sides of the unit. Also, do not position with the rear panel
facing down on the floor or other surface.
10.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.
11. As this speaker contains strong magnet, avoid placing watches,
magnetic tapes, etc. near this unit. Also, placing the speaker near
a TV set may impair picture color. If this happens, move the TV
set away from the speaker.
12.If you hear distortion (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.
13.This unit has a port called “air woofer” which is for reproducing a
super-bass sound.
Be careful not to put a hand or some objects into the port,
otherwise it may give you an electric shock or give this unit a
damage, or cause a fire.
14.Voltage Selector (General Model only)
The voltage selector on the rear panel of this unit must be set
for your local main voltage BEFORE plugging into the AC
main supply.
Voltages are AC 110/120/220/240V, 50/60 Hz.
IMPORTANT
Please record the serial number of this unit in the space below.
Serial No.:
The serial number is located on the rear of the unit.
Retain this Owner’s Manual in a safe place for future reference.
WARNING
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
CAUTION (FOR CANADA MODEL)
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT AND FULLY INSERT.
FOR CANADIAN CUSTOMER
THIS CLASS B DIGITAL APPARATUS MEETS ALL
REQUIREMENTS OF THE CANADIAN INTERFERENCE-CAUSING
EQUIPMENT REGULATIONS.
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 THE 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.
The apparatus is not disconnected from the AC power
source as long as it is connected to the wall outlet, even if
the apparatus itself is turned off.
CAUTION: READ THIS BEFORE OPERATING YOUR UNIT.
Caution ...........................................................................4
Features .........................................................................5
Placement ......................................................................5
Connections ...................................................................6
Controls and their functions ..........................................11
Adjusting volume ..........................................................13
Active Servo Technology ..............................................15
Troubleshooting ............................................................16
Specifications ...............................................................16
CONTENTS
5
English
•
This subwoofer system employs YAMAHA Active Servo
Technology which YAMAHA developed for reproducing
higher quality super-bass sound. (Refer to page 15 for
details on Active Servo Technology.)
This unit does not only enhance bass frequency response of
sound output in your audio system, but, by reproducing the
bass frequencies, the subwoofer permits your existing
amplifier and speakers to operate under less strenuous
conditions, improving overall system performance.
•
This unit can be added easily to your existing audio system
by connecting to either the speaker terminals or the line
output (pin jack) terminals of the amplifier.
•
The use of the H.P.F. OUTPUT terminals for connecting
with the amplifier is effective for improving sound quality of
your speaker system.
This connection prevents sound output from the main
speakers from muddying by filtering out low frequencies of
input signals to be sent to the main speakers which are not
suitable for reproducing low frequencies.
•
For the effective use of this unit, this unit’s super-bass
sound must be matched to the sounds of your main
speakers. Therefore, this unit employs a continuously
variable high frequency cut-off point (HIGH CUT) control.
Moreover, the PHASE switch allows you to select the best
sound quality for various listening conditions.
•
A newly employed AUTO POWER ON/OFF switch saves
you the trouble of pressing the POWER switch when turning
the power on and off.
If using one subwoofer, it is recommended to place it on the
outside of either the right or the left main speaker. (See fig.
.) If using two subwoofers, it is recommended to place them
on the outside of each main speaker. (See fig. .) The
placement shown in fig. 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. To prevent this, face the
subwoofer system obliquely to the wall as shown in fig. or
.
One subwoofer will have a good effect on your audio system,
however, the use of two subwoofers is recommended to obtain
more presence.
Note
There may be a case that you cannot obtain enough super-
bass sounds from this unit when listening at the middle of the
room. This is because “standing waves” have developed
between two parallel walls and the bass sounds are being
canceled.
In such a case, face the unit obliquely to the wall. It also may
be necessary to break up the parallel surfaces by placing
bookshelves etc. along the walls.
FEATURES
PLACEMENT
( : subwoofer, : main speaker)
A
B
C
A
A
B
B
C
6
• Before attempting to make any connections to or from this unit, be sure to first switch OFF the power to this unit and to any other
components to which connections are being made.
• When making connections between this unit and other components, be sure all connections are made correctly and consistently,
that is to say L (left) to L, R (right) to R, “+” to “+” and “–” to “–”.
• This unit can be connected to either the speaker terminals or the line output (pin jack) terminals of the amplifier. Choose one of
the ways shown below which is suitable for your audio system. Also, refer to the owner’s manual for each component to be
connected to this unit.
CONNECTING TO SPEAKER TERMINALS OF THE AMPLIFIER
Disconnect your main speakers from the amplifier and connect them to this unit.
To connect one unit only
To connect two units
CONNECTIONS
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
This unit
Left speakerRight speaker
Left speaker
Right speaker
Amplifier
Amplifier
To AC outlet
To AC outlet
To AC outlet
This unit
This unit
7
English
If your amplifier has two sets of speaker terminals
For connections, cut the speaker wires as short as possible. If
the connections are faulty, no sound will be heard from the
speakers. Make sure that the polarity of the speaker wires is
correct, that is, + and – markings are observed. If these wires
are reversed, the sound will be unnatural and will lack bass.
Do not let the bare speaker wires touch each other and do
not let them touch the metal parts of this unit as this could
damage this unit, your amplifier and/or speakers.
How to Connect:
Red: positive (+)
Black: negative (–)
1 Unscrew the knob.
2 Insert the bare wire.
[Remove approx. 5mm
(1/4”) insulation from
the speaker wires.]
3 Tighten the knob and
secure the wire.
* Banana Plug connections are also possible (except for U.K.
and Europe models). Simply insert the Banana Plug
connector into the corresponding terminal.
Connecting to this unit’s OUTPUT/INPUT terminals
AB
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
1
2
3
This unit
(Both “A” and “B” outputs
must be ON.)
Left speaker
Right speaker
Amplifier
To AC outlet
CONNECTING TO LINE OUTPUT (PIN JACK) TERMINALS OF THE AMPLIFIER
• Leave the main speakers connected to the amplifier.
1 CONNECTING TO PRE OUT OR SUBWOOFER OUT TERMINAL(S)
• Amplifier line output terminals are generally labeled PRE OUT or SUBWOOFER OUT.
* For PRE OUT terminal connection, the amplifier must possess at least two sets of PRE OUT terminals. With some amplifiers
with only one set of PRE OUT terminals, connection can result in no sound from the main left and right speakers. In this case,
select the method of connecting to the speaker terminals.
• To connect with a YAMAHA DSP amplifier, connect the LOW PASS (or SUBWOOFER etc.) terminal on the rear of the DSP
amplifier to either the left (L) or right (R) INPUT 2 terminal.
To connect one unit only
To connect two units
Notes
• When connected to line output terminals of the amplifier, other speakers should not be connected to the OUTPUT terminals on
the rear panel of this unit. If connected, they will not produce sound.
• When connecting to a monaural line output terminal of the amplifier, connect to either the left or right INPUT 2 terminal.
8
PRE OUT
(SPLIT, SUBWOOFER)
LOW PASS
(SUBWOOFER)
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
PRE OUT
(SPLIT, SUBWOOFER)
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
This unit
Pin plug cords
<YAMAHA DSP amplifier>
<
Amplifier>
Right speakerLeft speaker
Amplifier
To AC outlet
This unit This unit
Pin plug
cords
Right speaker
Left speaker
Amplifier
To AC outlet To AC outlet
9
English
2 CONNECTING TO PRE OUT AND MAIN IN TERMINALS
The use of the H.P.F. OUTPUT terminals for connections with the amplifier will improve sound quality of your speaker system.
The H.P.F. (High-Pass Filter) OUTPUT terminals of this unit cut off frequencies below the selected frequency point from the input
signals, and output high frequencies only. By connecting this terminal with the MAIN IN terminals of the amplifier, the main speakers
reproduce high frequencies only.
This will make the whole sound quality clear by preventing sound muddying between the main speakers and this unit.
* This connection can be made if your amplifier has PRE OUT and MAIN IN terminals or you are using separate amplifiers (pre-
amplifier and main amplifier).
To connect one unit only
MAIN INPRE OUT
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
This unit
Pin plug cords
Pin plug cords
<Amplifier>
Right speakerLeft speaker
Amplifier
To AC outlet
10
MAIN INPRE OUT
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
This unit This unit
Pin plug cords
Right speaker
Left speaker
Amplifier
To AC outlet To AC outlet
To connect two units
Switching the H.P.F. OUTPUT switch
After the connection is made, select the desired frequency
point (50 Hz, 80 Hz or 100 Hz) with the H.P.F. OUTPUT
switch.
Only frequencies higher than the selected frequency are output
from the H.P.F. OUTPUT terminals.
Normally, it is recommended to select the frequency point
nearer to the main speakers’ minimum reproduceable
frequency.
H.P.F.OUTPUT
50Hz I00Hz
80Hz
11
English
1 POWER indicator
Lights in green when the POWER switch is turned ON,
and goes off when turned OFF.
* Standby mode
If the AUTO POWER ON/OFF switch on the rear panel
is set to ON, this indicator lights in red when no signal
is input to this unit.
2 POWER switch
Turns the power of this unit ON and OFF whenever
pressed. When this switch is turned ON, the POWER
indicator over the POWER switch lights up.
3 VOLUME control
Adjusts the volume level.
4 HIGH CUT control
Adjusts the high frequency cut off point.
Frequencies higher than the frequency selected by this
control are all cut off (and not output).
* One graduation of this control represents 10 Hz.
5 TONE control
Used to increase or decrease the low frequency response.
Turn this clockwise (toward the MOVIE position) to
increase the low frequency response.
Turn this counterclockwise (toward the MUSIC position) to
decrease the low frequency response.
6 OUTPUT (TO SPEAKERS) terminals
Can be used for connections with the main speakers.
These terminals send signals output from the amplifier to
the main speakers directly.
7 INPUT1 (FROM AMPLIFIER) terminals
Used to connect this unit with the speaker terminals of the
amplifier.
CONTROLS AND THEIR FUNCTIONS
POWER
VOLUME
0I0
HIGH CUT
40Hz I40Hz
TONE
MUSIC MOVIE
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
87 0 A
6
9 B
I40 Hz40 Hz
50
60
70
80
90
I00
II0
I20
I30
TONE
MUSIC MOVIE
50 Hz
MOVIE
CENTER
MUSIC
Side panel Rear panel
1
2
3
4
5
FREQUENCY
CHARACTERISTICS
12
8 AUTO POWER ON/OFF switch
By setting this switch to the ON position, this unit’s
automatic power ON/OFF function operates as described
below. If you do not need this function, set to the OFF
position.
* Make sure to change the setting of this switch only
when the power of this unit is off.
Automatic power ON/OFF function
When you play a source, the power to this unit turns on
automatically by sensing audio signals input to this unit.
The power turns off automatically if the source being
played is stopped or the input signal is cut off for several
minutes.
* This function will operate responding to a certain level of
input signal. Increase the output level on the input
source if the automatic power ON function will not
operate, or decrease the level if the automatic power
OFF function will not operate.
* There may be a case that the power turns on
unexpectedly by sensing noise from other appliances. If
it occurs, set the AUTO POWER ON/OFF switch to the
OFF position.
This function is available only when the power of this
unit is on (by setting the POWER switch (
2) to “on”).
9 PHASE switch
Normally this switch is to be set to the normal (NOM)
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
reverse (REV) position. Select the better position by
monitoring the sound.
0 INPUT2 terminals
Used to input line level signals from the amplifier.
A H.P.F. OUTPUT terminals
These terminals cut off frequencies below the frequency
point selected by the H.P.F. OUTPUT switch from the
input signals and output higher frequencies only.
B H.P.F. OUTPUT switch
Use this switch only when the H.P.F. OUTPUT terminals
are used for connecting with the amplifier. (See page 8 for
details)
13
English
1 Set the VOLUME control to minimum.
2 Turn on the power supply to all the components.
3 Play any source and adjust the amplifier’s volume control
to the desired listening level.
4 Turn up the VOLUME control gradually to adjust the
volume balance between this unit and the main speakers.
5 Adjust the HIGH CUT control to the position where the
desired response can be obtained.
6 Set the PHASE switch to the position (NOM or REV)
where the optimum bass effect can be obtained.
Notes
•
Once the volume balance between this unit and the main
speakers is adjusted, you can adjust the volume of your
whole sound system by using only the amplifier’s volume
control.
•
For adjusting the VOLUME control, the HIGH CUT control
and the PHASE switch, refer to “FREQUENCY
CHARACTERISTICS” on the next page.
For effective adjustment of the HIGH CUT control
First set this control at about the main speakers’ rated
minimum reproduceable frequency. Then turn up the
VOLUME control gradually and set it at a level where you can
obtain a little more bass effect than when this unit is not used.
On the basis of this setting, if desired, adjust the VOLUME
control and the HIGH CUT control again.
* The main speakers’ minimum reproduceable frequency can
be looked up in the speakers’ catalog or owner’s manual.
ADJUSTING VOLUME
Side panel Rear panel
POWER
VOLUME
0I0
HIGH CUT
40Hz I40Hz
TONE
MUSIC MOVIE
OUTPUT
TO SPEAKERS
INPUT1
FROM AMPLIFIER
INPUT2 H.P.F.OUTPUTPHASE
NOM REV 50Hz I00Hz
80Hz
ON OFF
AUTO
POWER
6
1, 4
5
14
FREQUENCY CHARACTERISTICS
Adjustment of the VOLUME control, the HIGH CUT control and the PHASE switch should be changed according to the main
speakers, listening condition, source, etc.
Following figures show the optimum adjustment of each control and the frequency characteristics when this unit is combined with a
typical speaker system.
This unit’s frequency characteristics
•
When combined with a 4” or 5” acoustic
suspension, 2 way system
PHASE–Set to the reverse (REV) position.
•
When combined with an 6” or 8” acoustic
suspension, 2 way system
PHASE–Set to the reverse (REV) position.
VOLUME
0I0
HIGH CUT
40Hz I40Hz
VOLUME
0I0
HIGH CUT
40Hz I40Hz
20 50 100 200 500Hz
40
50
60
70
80
90
dB
HIGH CUT 40 Hz
HIGH CUT 90 Hz
HIGH CUT
140 Hz
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW300
20 50 100 200 500Hz
40
50
60
70
80
90
dB
YST-SW300
Main
speaker’s
response
Main
speaker’s
response
15
English
ACTIVE SERVO TECHNOLOGY
The theory of Active Servo Technology is 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 output
from this opening as waves of great amplitude if the
design is such that 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 design in which the amplifier functions to
supply 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, and,
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, and 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 Active Servo Technology.
REMOVING THE FRONT GRILLE
The front grille is fastened to the enclosure at four points,
and can be removed if desired. To remove the grille, first
hold the bottom of the grille and unfasten the lower part of
the grille by pulling it gently, and then hold both sides of the
grille and slowly pull straight away from the speaker. To
reattach, line up the four pegs on the inside surface of the
grille with the four corresponding holes on the speaker and
push gently.
Note
When the grille is removed, take care not to touch the
speaker unit with your hands or to exert excessive force
with tools.
Signals of low amplitude
Air woofer
(Helmholtz resonator)
Negative-impedance
output drive
High-
amplitude
bass
sound
Signals
Active Servo
Processing Amplifier
Cabinet
Port
16
SYMPTOM
Power is not supplied even though the
POWER switch is ON.
No sound.
Sound level is too low.
Automatic power ON function will not
work.
Automatic power OFF function will work
unexpectedly.
Automatic power ON function will work
unexpectedly.
CAUSE
The power plug is not securely connected.
The VOLUME control is set to 0.
Speaker cables are not connected securely.
Speaker cables are connected incorrectly.
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 turned off.
The level of input signal is too low.
The level of input signal is too low.
An influence of noise generated from
external digital equipment etc.
REMEDY
Connect it securely.
Turn the VOLUME control to right.
Connect them securely.
Connect them correctly, that is to say 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. (Turn the knob to right.)
Re-position the subwoofer or break up the
parallel surface by placing bookshelves etc.
along the walls.
Turn the POWER switch on.
Increase the level of input signal on the
source.
Increase the level of input signal on the
source.
Move this unit farther away from such
equipment and/or change the position of
connected speaker cables.
Otherwise, do not use the automatic power
ON function of this unit.
If the unit fails to operate normally, check the following points to determine whether the fault can be corrected by the simple
measures suggested. If it cannot be corrected, or if the fault is not listed in the SYMPTOM column, disconnect the power cord and
contact your authorized YAMAHA dealer or service center for help.
TROUBLESHOOTING
SPECIFICATIONS
Type......................Active Servo Processing Subwoofer System
Speaker Unit.............................30 cm (11-13/16”) cone woofer
magnetic-shield type
Amplifier Output..................................................185W/5 ohms
High-Cut Filter...............................40 Hz–140 Hz (–24 dB/oct.)
Impedance
INPUT 1...................................................................4.7 k-ohms
INPUT 2....................................................................10 k-ohms
Frequency Response ..........................18 Hz–170 Hz (–10 dB)
Power Supply...................................................AC 120V, 60 Hz
Power Consumption........................................................150W
Dimensions (W x H x D) ..........400 mm x 500 mm x 434.5 mm
(15-3/4” x 19-11/16” x 17-1/16”)
Weight....................................................25.4 kg (55 lbs. 14 oz.)
* 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 VÄSTRA FRÖLUNDA, SWEDEN
YAMAHA MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA
VV96060 Printed in Malaysia
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