YST-SW015

Subwoofer System

U B

YST-SW015(UB)-PRE-c 1

OWNER’S MANUAL

03.2.28, 7:25 PM

IMPORTANT SAFETY INSTRUCTIONS

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 APPLIANCE TO RAIN

OR MOISTURE.

IMPORTANT

Please record the serial number of this unit in the space below.

Model:

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.

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.

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.

● Be sure to allow spaces of at least 20 cm above, behind and on both sides of the unit.

● Do not place the following objects on this unit:

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.

II

YST-SW015(UB)-PRE-c 2 03.2.28, 7:25 PM

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.

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.

YST-SW015(UB)-PRE-c 3 03.2.28, 7:25 PM

III

UNPACKING

Please check to make sure all listed items are included.

Nonskid pads

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.

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

YST-SW015(UB)-PRE-c 4 03.2.28, 7:25 PM

Thank you for selecting this YAMAHA Subwoofer System.

CAUTION: Read this before operating your unit.

Please read the following operating precautions before use.

YAMAHA will not be held responsible for any damage and/or injury caused by not following the cautions below.

●

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.

●

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

●

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 equipment. Never pull the wires themselves.

●

When not planning to use this unit for a long period (i.e.

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 spaces of at least 20 cm 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.

●

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 place a fragile object near the YST port of this unit. If the object falls or drops by the air pressure, it may cause damage to the unit and/or personal injury.

●

Never put a hand or a foreign object into the YST port located on the front of this unit. When moving this unit, do not hold the port as it might cause personal injury and/or damage to this unit.

●

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

(For China, Korean and General models)

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.

110V–120V 220V–240V

VOLTAGE

SELECTOR

Standby mode

If the POWER switch is set to the ON position and the

AUTO STANDBY switch is set to the HIGH or LOW position, this unit turns into the standby mode when no signal is received by this unit for 7 to 8 minutes.

In this state, this unit is designed to consume a very small quantity of power.

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.

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SW015(UB) (03.2.28)a 1 03.2.28, 7:25 PM

CONTENTS

IMPORTANT SAFETY INSTRUCTIONS

................................................................. II

UNPACKING ........................................... IV

CAUTION .................................................. 1

FEATURES ............................................... 2

SPECIFICATIONS ................................... 2

PLACEMENT ............................................ 3

CONNECTIONS ....................................... 4

CONTROLS AND THEIR

FUNCTIONS ............................................ 5

AUTOMATIC POWER-SWITCHING

FUNCTION ............................................... 6

ADJUSTING THE SUBWOOFER

BEFORE USE .......................................... 7

Frequency characteristics ...................... 8

ADVANCED YAMAHA ACTIVE

SERVO TECHNOLOGY ........................... 9

TROUBLESHOOTING ............................ 10

FEATURES

● This subwoofer system employs Advanced Yamaha

Active Servo Technology which YAMAHA has developed for reproducing higher quality super-bass sound. (Refer to page 9 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.

● For the effective use of the subwoofer, the subwoofer’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.

QD-Bass Technology

QD-Bass (Quatre Dispersion Bass) technology uses square, pyramid-shaped reflective plates to radiate the sound in four horizontal directions.

SPECIFICATIONS

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

Magnetic shielding type

Driver ....................................... 16 cm (6-1/2”) cone woofer

Amplifier Output .................................................. 70 W/5

Ω

Frequency Response ............................... 30 Hz to 200 Hz

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Power Supply

U.S.A. and Canada models .................... AC 120V, 60 Hz

U.K. and Europe models ........................ AC 230V, 50 Hz

Australia model ....................................... AC 240V, 50 Hz

China, Korean and General models

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

Power Consumption ................................................. 70 W

Standby Power Consumption ................................. 0.8 W

Dimensions (W x H x D) ..... 280 mm x 325 mm x 320 mm

(11” x 12-13/16” x 12-5/8”)

Weight ................................................ 9.2 kg (20 lbs. 4 oz.)

* Specifications are subject to change without notice due to product improvements.

SW015(UB) (03.2.28)a 2 03.2.28, 7:25 PM

PLACEMENT

Å ı

( : subwoofer, : main speaker)

It is recommended to place the subwoofer on the outside of either the right or the left main speaker. (See fig. Å .) The placement shown in fig. ı 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 shown in fig. Å.

Note

There may be a case that you cannot obtain enough superbass 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.

Use the non-skid pads

Put the provided non-skid pads at the four corners on the bottom of the subwoofer to prevent the subwoofer from moving by vibrations etc.

SUBWOOFER SYSTEM YST-SW015

STANDBY/ON

B.A.S.S.

HIGH CUT50–150Hz

VOLUME 0–10

■ About this manual

• This manual is printed prior to production. Design and specifications are subject to change in part for the reason of the improvement in operativity ability, and others. In this case, the product has priority.

• Some of the illustrations and names of the package contents etc. written in this manual may differ from the actual products and the names written on the package etc.

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CONNECTIONS

Caution: Plug in the subwoofer and other audio/video components after all connections are completed.

Connect the subwoofer to the line output (pin jack) terminal(s) of the amplifier.

● To connect with a YAMAHA DSP amplifier (or AV receiver), connect the SUBWOOFER (or LOW PASS etc.)

● When connecting the subwoofer to the SPLIT

SUBWOOFER terminals on the rear of the DSP amplifier, terminal on the rear of the DSP amplifier (or AV receiver) to the L/MONO INPUT terminal of the subwoofer.

be sure to connect the L/MONO INPUT terminal to the

“L” side and the R INPUT terminal to the “R” side of the

SPLIT SUBWOOFER terminals.

Right main speaker

Subwoofer cable

(not included)

Left main speaker

Subwoofer

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

ON

POWER

OFF

110V–120V 220V–240V

VOLTAGE

SELECTOR

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

To AC outlet

Audio pin cable

(not included)

SPLIT SUBWOOFER

Amplifier

SUBWOOFER

( LOW PASS)

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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.

SW015(UB) (03.2.28)a 4

● When connecting to a monaural line output terminal of the amplifier, connect the L/MONO INPUT terminal.

03.2.28, 7:25 PM

CONTROLS AND THEIR FUNCTIONS

Front panel

SUBWOOFER SYSTEM YST-SW015

STANDBY/ON B.A.S.S.

HIGH CUT50–150Hz VOLUME 0–10

SUBWOOFER SYSTEM YST-SW015

STANDBY/ON B.A.S.S.

HIGH CUT50–150Hz VOLUME

0–10

Port

1 2 3 4 5

6

110V–120V 220V–240V

VOLTAGE

SELECTOR

ON

POWER

OFF

7

Rear panel (General model)

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

ON

POWER

OFF

110V–120V 220V–240V

VOLTAGE

SELECTOR

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

8 9 0

1

Power indicator

Lights up in green while the subwoofer is on.

Lights up in red while the subwoofer is set in the standby mode by the operation of the automatic powerswitching function.

Goes off when the subwoofer is set in the standby mode.

2

STANDBY/ON button

Press this button to turn on the power when the

POWER (

7

) switch is set in the ON position. (The power indicator lights up in green.)

Press again to set the subwoofer in the standby mode.

(The power indicator goes off.)

Standby mode

The subwoofer is still using a small amount of power in this mode.

3

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.

MOVIE MUSIC

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 no output).

* One graduation of this control represents 10 Hz.

90 Hz

80 Hz

100 Hz

110 Hz

120 Hz

70 Hz 130 Hz

60 Hz

50 Hz

140 Hz

150 Hz

5

VOLUME control

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

6

VOLTAGE SELECTOR switch

(For China, Korean and General models)

If the preset setting of the switch is incorrect, set the switch to the proper voltage range (220V-240V or

110V-120V) 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.

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7

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.

8

INPUT terminals

Used to input line level signals from the amplifier.

(Refer to “CONNECTIONS” for details.)

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 subwoofer is set in the standby mode by pressing the STANDBY/ON (

2

) button.

0

PHASE switch

Normally this switch is to be set to the REV (reverse) position. However, according to the listening condition or your preference, 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.

AUTOMATIC POWER-SWITCHING FUNCTION

IIf 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 powerswitching 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 this function does not operate 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 in the standby mode 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).

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ADJUSTING THE SUBWOOFER BEFORE USE

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.

Front panel

SUBWOOFER SYSTEM YST-SW015

STANDBY/ON B.A.S.S.

HIGH CUT50–150Hz VOLUME 0–10

SUBWOOFER SYSTEM YST-SW015

STANDBY/ON B.A.S.S.

HIGH CUT

50–150Hz

VOLUME

0–10

ON

POWER

OFF

3

Rear panel

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

110V–120V 220V–240V

VOLTAGE

SELECTOR

ON

POWER

OFF

3 8 5 1, 6

/MONO

INPUT

AUTO

STANDBY

PHASE

OFF LOW HIGH NORM REV

7

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 the subwoofer 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.

8

Select “MOVIE” or “MUSIC” according to the played source.

MOVIE: When a movie type source is played, the lowfrequency 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.

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Frequency characteristics

This subwoofer’s frequency characteristics

100

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.

EX.

When combined with an 3.5” or 4” (8 cm or 10 cm) acoustic suspension, 2 way system main speakers

100 dB

HIGH CUT

50–150Hz

VOLUME

0–10

PHASE–Set to the REV

(reverse) position.

B.A.S.S.–MOVIE

90

80

70

60

50

40

20 50

Main speaker’s response

100 200 500Hz

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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, lowfrequency 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

Port

Air woofer

(Helmholtz resonator)

Cabinet

Advanced Negativeimpedance Converter

Active Servo

Processing

Amplifier

Signals

Signals of low amplitude

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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.

No sound.

Problem

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

Sound level is too low.

The subwoofer does not turn on automatically.

The subwoofer does not turn into the standby mode automatically.

The subwoofer turns into the standby mode unexpectedly.

The subwoofer turns on unexpectedly.

Cause

The power plug is not securely connected.

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.

What to Do

Connect it securely.

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.

It is influenced by standing waves.

The POWER switch is set to the OFF position.

The STANDBY/ON button is set to the

OFF position.

The AUTO STANDBY switch is set to the OFF position.

The level of input signal is too low.

There is an influence of noise generated from external appliances etc.

The AUTO STANDBY switch is set to the OFF position.

The level of input signal is too low.

There is an influence of noise generated from external appliances etc.

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 the ON position.

Set the AUTO STANDBY switch to the

“HIGH” or “LOW” position.

Set the AUTO STANDBY switch to the

“HIGH” position.

Move the subwoofer further away from such appliances and/or reposition the connected speaker cables.

Otherwise, set the AUTO STANDBY switch to the “OFF” position.

Set the AUTO STANDBY switch to the

“HIGH” or “LOW” 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.

E-

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SW015(UB) (03.2.28)a 10 03.2.28, 7:25 PM

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