Yamaha YST-SW315 User Manual





Subwoofer System










Read these instructions.

Keep these instructions.

Heed all warnings.

Follow all instructions.

Do not use this apparatus near water.

Clean only with dry cloth.

Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

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.

8Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9Do 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.

10Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.




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


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.

11Only use attachments/accessories specified by the manufacturer.

12Use 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.

13Unplug this apparatus during lightning storms or when unused for long periods of time.

14Refer 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 the 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.

FCC INFORMATION (for US customers)


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.

2IMPORTANT : 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.

3NOTE : 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


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.

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 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 at least 20 cm of space 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 the following objects on this unit: Glass, china, small metallic etc.

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

A burning candle etc.

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

A vessel with water in it

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

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 put a hand or a foreign object into the YST port located on the right side of this unit. When moving this unit, do not hold the port as it might cause personal injury and/or damage to this unit.

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 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.



(For China, Korea 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.

Standby mode

When this unit is turned off by pressing the STANDBY/ON button on the front panel, this unit consumes a small amount of power. This state is called the standby mode. This unit’s power supply is completely cut off from the AC line only when the POWER switch on the rear panel is set in the OFF position or the AC power cord is disconnected.

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

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.





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.



CAUTION ......................................................................


FEATURES ....................................................................


SUPPLIED ACCESSORIES ...........................................


PLACEMENT ................................................................


CONNECTIONS ...........................................................


1 Connecting to line output (pin jack) terminals


of the amplifier ....................................................


2 Connecting to speaker output terminals of


the amplifier ..........................................................


Connecting to the INPUT1/ OUTPUT terminals


of the subwoofer .......................................................


Plug in the subwoofer to the AC outlet ....................






FUNCTION .................................................................




BEFORE USE .............................................................


Frequency characteristics .........................................




TECHNOLOGY ..........................................................


TROUBLESHOOTING ...............................................


SPECIFICATIONS .......................................................




This subwoofer system employs Advanced Yamaha Active Servo Technology which Yamaha has developed for reproducing higher quality super-bass sound. (Refer to page 18 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 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 and off.

You can select bass effect suitable for the source by using the B.A.S.S. button.


After unpacking, check that the following parts are contained.

Non-skid pads

QD-Bass Technology

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


Yamaha YST-SW315 User Manual







: subwoofer,


: main speaker)



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. A .) If using two subwoofers, it is recommended to place them on the outside of each main speaker. (See fig. B .) The placement shown in fig. C 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. A or B .


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.



Choose one of the following two connecting methods that is more suitable for your audio system.

Choose 1 (pages 5-7) if your amplifier has line output (pin jack) terminal(s)

Choose 2 (pages 8-11) if your amplifier has no line output (pin jack) terminal

Caution: Unplug the subwoofer and other audio/video components before making connections.


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 of your component to be connected to the subwoofer.

After all connections are completed, plug in the subwoofer and other audio/video components.

1Connecting to line output (pin jack) terminals of the amplifier

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.

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.


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 8-11.)

When connecting to a monaural line output terminal of the amplifier, connect the L/MONO INPUT2 terminal.

When connecting to line output terminals of the amplifier, other speakers should not be connected to the OUTPUT terminals on the rear panel of the subwoofer. If connected, they will not produce sound.


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