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YST-SW120/60 Active Servo Processing Subwoofer System Built-in 70W Power Amplifier (YST-SW120) Built-in 50W Power Amplifier (YST-SW60) 2 Way Selectability for Connections High Frequency Cut-off Point (HIGH CUT) Control PHASE Switch Active Servo Thank you for selecting this YAMAHA Subwoofer System. Technology 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. OWNER’S MANUAL IMPORTANT! Please record the serial number of this unit in the space below. CONTENTS Safety Instructions ...................2 Features...................................4 Placement................................4 Connections.............................5 Controls and Their Functions .......8 Adjusting Volume .....................9 Active Servo Technology ........11 Troubleshooting ......................12 Specifications .........................12 • Explanation of Graphical Symbols 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. WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. 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 2 3 4 5 6 6A 7 8 9 10 Read Instructions – All the safety and operating instructions should be read before the unit is operated. Retain Instructions – The safety and operating instructions should be retained for future reference. Heed Warnings – All warnings on the unit and in the operating instructions should be adhered to. Follow Instructions – All operating and other instructions should be followed. 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. Carts and Stands – The unit should be used only with a cart or stand that is recommended by the manufacturer. 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. Wall or Ceiling Mounting – The unit should be mounted to a wall or ceiling only as recommended by the manufacturer. 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. Heat – The unit should be situated away from heat sources such as radiators, stoves, or other appliances that produce heat. 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 12 13 14 15 A. B. C. D. E. 16 17 18 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. Cleaning – The unit should be cleaned only as recommended by the manufacturer. Nonuse Periods – The power cord of the unit should be unplugged from the outlet when left unused for a long period of time. 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. Damage Requiring Service – The unit should be serviced by qualified service personnel when: The power-supply cord or the plug has been damaged; or Objects have fallen, or liquid has been spilled into the unit; or The unit has been exposed to rain; or The unit does not appear to operate normally or exhibits a marked change in performance; or The unit has been dropped, or the cabinet damaged. 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. Power Lines – An outdoor antenna should be located away from power lines. Grounding or Polarization – Precautions should be taken so that the grounding or polarization is not defeated. CAUTION: READ THIS BEFORE OPERATING YOUR UNIT 1 To assure the finest performance, please read this manual 2 3 4 5 6 7 2 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 the unit to rain or water. Never open the cabinet. If something drops into the set, contact your dealer. 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. Do not attempt to clean the unit with chemical solvents; 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. 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 10 11 12 radiate from the rear panel. Therefore, place the unit at least 10 cm (4 inches) away from the wall. Also, do not position with the rear panel facing down on the floor or other surface. 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 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. 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.  FCC INFORMATION 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. 3  FEATURES • This subwoofer system employs YAMAHA Active Servo Technology which YAMAHA developed for reproducing higher quality super-bass sound. (Refer to page 11 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. 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. PLACEMENT A B 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. To prevent this, face the subwoofer system obliquely to the wall as shown in fig. A or B . 4 C 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 superbass 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.  CONNECTIONS • 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 according to 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. If using one unit Right speaker Left speaker OUTPUT INPUT2 PHASE TO SPEAKERS This unit OUTPUT INPUT2 NOM REV FROM AMPLIFIER INPUT1 PHASE TO SPEAKERS NOM REV FROM AMPLIFIER INPUT1 Amplifier To AC outlet If using two units Right speaker Left speaker OUTPUT INPUT2 PHASE This unit OUTPUT INPUT2 PHASE TO SPEAKERS TO SPEAKERS NOM REV NOM REV This unit OUTPUT INPUT2 PHASE TO SPEAKERS OUTPUT INPUT2 FROM AMPLIFIER INPUT1 PHASE TO SPEAKERS FROM AMPLIFIER INPUT1 NOM REV FROM AMPLIFIER INPUT1 NOM REV FROM AMPLIFIER INPUT1 Amplifier To AC outlet To AC outlet 5  If your amplifier has two sets of speaker terminals Right speaker This unit OUTPUT INPUT2 OUTPUT INPUT2 Left speaker PHASE TO SPEAKERS PHASE TO SPEAKERS NOM REV FROM AMPLIFIER INPUT1 NOM REV FROM AMPLIFIER INPUT1 To AC outlet Amplifier A B (Both “ A”and “ B” outputs must be ON.) Connecting to this unit’s OUTPUT/INPUT 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 (–) 2 1 3 6 ➀ Unscrew the knob. ➁ Insert the bare wire. [Remove approx. 5mm (1/4”) insulation from the speaker wires.] ➂ Tighten the knob and secure the wire. * Banana Plug connections are also possible (except for Scandinavian model). Simply insert the Banana Plug connector into the corresponding terminal.  CONNECTING TO LINE OUTPUT (PIN JACK) TERMINALS OF THE AMPLIFIER • Leave the main speakers connected to the amplifier. • 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. If using one unit Left speaker This unit OUTPUT INPUT2 Right speaker PHASE TO SPEAKERS OUTPUT INPUT2 PHASE TO SPEAKERS NOM REV FROM AMPLIFIER INPUT1 NOM REV FROM AMPLIFIER INPUT1 Pin plug cords To AC outlet Amplifier PRE OUT If using two units Left speaker Right speaker OUTPUT INPUT2 PHASE TO SPEAKERS OUTPUT INPUT2 NOM REV FROM AMPLIFIER INPUT1 This unit OUTPUT INPUT2 PHASE TO SPEAKERS NOM REV Pin plug cords FROM AMPLIFIER INPUT1 This unit PHASE OUTPUT TO SPEAKERS INPUT2 PHASE TO SPEAKERS NOM REV NOM REV FROM AMPLIFIER FROM AMPLIFIER INPUT1 INPUT1 PRE OUT Amplifier To AC outlet To AC outlet 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. 7  CONTROLS AND THEIR FUNCTIONS Front panel 1 POWER HIGH CUT 40 Hz 140 Hz YST-SW120 YST-SW120 1 YST-SW60 YST-SW60 VOLUME 0 10 POWER HIGH CUT 40 Hz 2 140 Hz VOLUME 0 3 POWER HIGH CUT 10 50 Hz 2 4 200 Hz 3 VOLUME 0 10 4 Rear panel OUTPUT INPUT2 PHASE TO SPEAKERS OUTPUT NOM REV INPUT2 PHASE TO SPEAKERS FROM AMPLIFIER INPUT1 NOM REV FROM AMPLIFIER INPUT1 5 1 POWER indicator 4 VOLUME control Illuminates when the POWER switch is turned ON, and goes off when turned OFF. 2 POWER switch Turns the power of this unit ON and OFF whenever pressed. When this switch is turned ON, the indicator over the POWER switch on the front panel illuminates. 3 HIGH CUT control Adjusts the high frequency cut off point. Frequencies higher than the frequency selected by this control are all cut off (and not output). * One graduation of this control represents 10 Hz. YST-SW120 80 70 90 I00 II0 60 I20 50 40 Hz 8 I30 I40 Hz YST-SW60 110 120 130 140 100 150 90 160 80 170 70 180 60 190 50 Hz 200 Hz Adjusts the volume level. 5 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.  ADJUSTING VOLUME Front panel YST-SW120 POWER HIGH CUT 40 Hz 2 140 Hz 5 YST-SW60 VOLUME 0 POWER 10 HIGH CUT 50 Hz 1, 4 2 200 Hz 5 VOLUME 0 10 1, 4 Rear panel OUTPUT INPUT2 PHASE TO SPEAKERS NOM REV FROM AMPLIFIER INPUT1 6 1 2 3 4 5 6 Set the VOLUME control to minimum. Turn on the power supply to all the components. Play any source and adjust the amplifier’s volume control to the desired listening level. Turn up the VOLUME control gradually to adjust the volume balance between this unit and the main speakers. Adjust the HIGH CUT control to the position where the desired response can be obtained. 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. 9  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. YST-SW60 YST-SW120 This unit’s frequency characteristics dB dB HIGH CUT 40 Hz HIGH CUT 90 Hz 90 HIGH CUT 120 Hz HIGH CUT 200 Hz 90 HIGH CUT 140 Hz 80 80 70 70 60 60 50 50 40 40 20 suspension, 2 way system HIGH CUT YST-SW60 VOLUME HIGH CUT 50 100 200 500Hz 20 50 VOLUME 100 200 500Hz YST-SW60 YST-SW120 • When combined with a 4” or 5” acoustic YST-SW120 HIGH CUT 50 Hz dB dB 90 90 80 80 YST-SW60 YST-SW120 70 40 Hz 140 Hz 0 10 50 Hz 200 Hz 0 10 70 60 50 PHASE–Set to the reverse (REV) position. 40 • When combined with an 8” or 10” acoustic YST-SW60 VOLUME HIGH CUT 50 100 200 500Hz 20 50 dB dB 90 90 YST-SW60 70 0 10 50 Hz 200 Hz 500Hz 80 YST-SW120 140 Hz 200 VOLUME 80 40 Hz 100 YST-SW60 YST-SW120 suspension, 2 way system YST-SW120 50 40 20 HIGH CUT Main speaker’s response 60 Main speaker’s response 0 70 10 Main speaker’s response 60 60 50 Main speaker’s response 50 PHASE–Set to the reverse (REV) position. 40 40 20 10 50 100 200 500Hz 20 50 100 200 500Hz  ACTIVE SERVO TECHNOLOGY The theory of Active Servo Technology is based upon two major factors, the Helmholtz resonator and negativeimpedance 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. Highamplitude bass sound 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. Air woofer (Helmholtz resonator) Port Active Servo Processing Amplifier Signals of low amplitude Signals Negative-impedance output drive 11  TROUBLESHOOTING 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. SYMPTOM CAUSE REMEDY Power is not supplied even though the POWER switch is ON. The power plug is not securely connected. Connect it securely. No sound . The VOLUME control is set to 0. Turn the VOLUME control to right. Speaker cables are not connected securely. Connect them securely. Speaker cables are connected incorrectly. Connect them correctly, that is to say L (left) to L, R (right) to R, “+” to “+” and “–” to “–”. Setting of the PHASE switch is not proper. Set the switch to the other position. A source sound with few bass frequencies is played. Play a source sound with bass frequencies. Set the HIGH CUT control to a higher position. (Turn the knob to right.) It is influenced by standing waves. Re-position the subwoofer or break up the parallel surface by placing bookshelves etc. along the walls. Sound level is too low. SPECIFICATIONS YST-SW120 Type .....................Active Servo Processing Subwoofer System Speaker Unit .................18 cm (7-1/16”) cone woofer (JA1821) magnetic-shield type x 2 Amplifier Output ..................70W/5 ohms (THD 0.1%, 100 Hz) High-Cut Filter...............................40 Hz–140 Hz (–24 dB/oct.) Frequency Response ..........................21 Hz–160 Hz (–10 dB) Power Supply U.S.A. and Canada models........................AC 120V, 60 Hz Australia and U.K. models.........................AC 240V, 50 Hz Europe model .............................................AC 230V, 50 Hz General model ..................AC 110/120/220/240V, 50/60 Hz YST-SW60 Type .....................Active Servo Processing Subwoofer System Speaker Unit .................18 cm (7-1/16”) cone woofer (JA1822) magnetic-shield type Amplifier Output ..................50W/6 ohms (THD 0.1%, 100 Hz) High-Cut Filter...............................50 Hz–200 Hz (–24 dB/oct.) Frequency Response ..........................25 Hz–250 Hz (–10 dB) Power Supply U.S.A. and Canada models........................AC 120V, 60 Hz Australia and U.K. models.........................AC 240V, 50 Hz Europe model .............................................AC 230V, 50 Hz General model ..................AC 110/120/220/240V, 50/60 Hz YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA Power Consumption........................................................100W Dimensions (W x H x D) .............215 mm x 590 mm x 412 mm (8-7/16” x 23-1/4” x 16-1/4”) Weight .....................................................15.5 kg (34 lbs. 2 oz.) * Please note that all specifications are subject to change without notice. Power Consumption..........................................................70W Dimensions (W x H x D) .............210 mm x 475 mm x 360 mm (8-1/4” x 18-11/16” x 14-3/16”) Weight ........................................................10 kg (22 lbs. 0 oz.) * Please note that all specifications are subject to change without notice. ELECTRONICS CORPORATION, USA 6660 ORANGETHORPE AVE., BUENA PARK, CALIF. 90620, U.S.A. CANADA MUSIC LTD. 135 MILNER AVE., SCARBOROUGH, ONTARIO M1S 3R1, CANADA ELECTRONIK EUROPA G.m.b.H. SIEMENSSTR. 22-34, D-2084 RELLINGEN BEI HAMBURG, F.R. OF GERMANY ELECTRONIQUE FRANCE S.A. 17 RUE DES CAMPANULES, LOGNES 77321 MARNE LA VALLEE CEDEX 2, FRANCE ELECTRONICS (UK) LTD. YAMAHA HOUSE, 200 RICKMANSWORTH ROAD WATFORD, HERTS WD1 7JS, ENGLAND SCANDINAVIA A.B. J A WETTERGRENS GATA 1, BOX 30053, 400 43 VÄSTRA FRÖLUNDA, SWEDEN MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA VR43210-0 BWWO,BR Printed in Japan