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UB YST-SW005 Subwoofer System OWNER’S MANUAL I  IMPORTANT SAFETY INSTRUCTIONS 1 Read these instructions. CAUTION 2 Keep these instructions. RISK OF ELECTRIC SHOCK DO NOT OPEN 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. 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 system 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. II  This device complies with Part 15 of the FCC Rules. Operation is subject to the following conditions: 1) this device may not cause harmful interference, and 2) this device must accept any interference received including interference that may cause undesired operation. See the user manual instructions if interference to radio reception is suspected. FCC INFORMATION (for US customers only) 1. 2. 3. 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. 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. 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 product “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., 6660 Orangethorpe Ave. Buena Park, CA90620 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. III  UNPACKING After unpacking, check that the following item is contained. Nonskid pads IV  English Thank you for selecting this YAMAHA subwoofer system. CAUTION: Read this before operating your unit. ● To assure the finest performance, please read this manual carefully. Keep it in a safe place for future reference. ● 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. ● 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. ● Vibration generated by super-bass frequencies may distort images on a TV. In such a case, move this unit away from the TV set ● Never open the cabinet. If something drops into the set, contact your dealer. ● Do not attempt to clean this unit with chemical solvents as this might damage the finish. Use a clean, dry cloth. ● To reduce the risk or fire or electric shock, do not expose this unit to rain or moisture. ● Be sure to read the “TROUBLESHOOTING” section regarding common operating errors before concluding that the unit is faulty. ● 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. ● 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. ● 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 electrical storm. ● Since this unit has a built-in power amplifier, heat will radiate from the rear panel. Place the unit apart from the walls, allowing enough 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. <For U.K., Europe and China models only> Be sure to allow space of at least 20 cm above, behind and on both sides of the unit. ● Do not cover the rear panel of this unit with a newspaper, a tablecloth, a curtain, etc. in order not to obstruct heat radiation. If the temperature inside the unit rises, it may cause fire, damage to the unit and/or personal injury. ● Do not place small metallic objects on this unit. Otherwise, the object may fall, possibly causing an injury. ● Do not place the following objects on this unit: Glass, china, etc. If glass etc. falls by vibrations and breaks, it may cause personal injury. A burning candle etc. If the candle falls by vibrations, it may cause fire and personal injury. A vessel with water in it If the vessel falls by vibrations and water spills, it may cause damage to the unit, and/or you may get an electric shock. ● Do not place this unit where foreign objects such as water drips might fall. It might cause a fire, damage to this unit, and/or personal injury. ● VOLTAGE SELECTOR (China and General models only) The VOLTAGE SELECTOR on the 110V-120V rear panel of this unit must be set 220V-240V for your local main voltage BEFORE plugging into the AC main supply. Voltages are 110-120/220-240 V AC, 50/60 Hz. VOLTAGE SELECTOR 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. ● Never put a hand or a foreign object into the YST port. When moving this unit, do not hold the port as it might cause personal injury and/or damage to this unit. For Canadian Customers ● 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. This Class B digital apparatus complies with Canadian ICES-003. ● 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 by using at high volume level when 20 Hz–50 Hz sine waves from a test disc, bass sounds from electronic instruments, etc. are continuously inputted to this unit, or when the stylus of a turntable touches the surface of a disc. Reduce the volume level to prevent this unit from being damaged. To prevent electric shock, match wide blade of plug to wide slot and fully insert. 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. E-1  FEATURES ● This subwoofer system employs Advanced YAMAHA Active Servo Technology which YAMAHA has developed for reproducing higher quality super-bass sound. (Refer to page 12 for details on Advanced YAMAHA Active Servo Technology.) This super-bass sound adds a more realistic, theater-in-the-home effect to your stereo system. ● This subwoofer can be easily added to your existing audio system by connecting to either the speaker terminals or the line output (pin jack) terminals of the amplifier. ● The HIGH CUT switch provides you with two positions (HIGH and LOW) to adjust the tone balance between the subwoofer and the main speakers. ● The AUTO STANDBY switch saves you the trouble of setting the POWER switch to the ON or OFF position. CONTENTS IMPORTANT SAFETY INSTRUCTIONS ......... II CONTROLS AND THEIR FUNCTIONS .......... 8 UNPACKING .................................................. IV AUTOMATIC POWER-SWITCHING FUNCTION ....................................................... 9 CAUTION ......................................................... 1 FEATURES ..................................................... 2 PLACEMENT .................................................. 3 CONNECTIONS .............................................. 4 Connecting to line output (pin jack) terminals of the amplifier .............................. 4 Connecting to speaker output terminals of the amplifier ............................................. 6 E-2 ADJUSTING THE SUBWOOFER BEFORE USE ............................................... 10 Frequency characteristics .......................... 11 ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY ............................................. 12 TROUBLESHOOTING .................................. 13 SPECIFICATIONS ......................................... 14  Å ( ı : subwoofer, Ç English PLACEMENT : 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. Å.) If using two subwoofers, it is recommended to place them on the outside of each main speaker. (See fig. ı.) The placement shown in fig. Ç is also possible, however, if the subwoofer system is placed directly facing the wall, the bass effect may die because the sound from it and the sound reflected by the wall may cancel out each other. To prevent this from happening, face the subwoofer system at an angle as in fig. Å or ı. Note There may be a case that you cannot obtain enough superbass sounds from the subwoofer when listening at the middle 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 nonskid pads Put the provided nonskid pads at the four corners on the bottom of the subwoofer to prevent the subwoofer from moving by vibrations etc. E-3  CONNECTIONS Caution: Plug in the subwoofer and other components after all connections are completed. ● All connections must be correct, that is to say L (left) to L, R (right) to R, “+” to “+” and “–” to “–”. Also refer to the owner’s manual for each of your components. ● Basically, connect the subwoofer to the line output (pin jack) terminal(s) of the amplifier. (Refer to pages 4 and 5 for details.) If your amplifier does not have any line output terminal, connect the subwoofer to the speaker output terminals of the amplifier. (Refer to pages 6 and 7 for details.) Connecting to line output (pin jack) terminals of the amplifier Connect the main speakers to the speaker output 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. 䡵 Using one subwoofer Left main speaker Right main speaker Subwoofer VOLUME 0 AUTO STANDBY 10 HIGH HIGH CUT LOW HIGH LOW OFF INPUT2 /MONO INPUT2 /MONO INPUT1 FROM AMPLIFIER OUTPUT TO SPEAKERS POWER ON OFF To AC outlet SUBWOOFER (LOW PASS) Amplifier SPLIT SUBWOOFER E-4  English 䡵 Using two subwoofers Left main speaker Right main speaker INPUT2 INPUT2 /MONO Right subwoofer /MONO Left subwoofer VOLUME VOLUME 0 0 AUTO STANDBY AUTO STANDBY HIGH CUT HIGH HIGH CUT LOW HIGH LOW OFF LOW INPUT2 INPUT2 10 10 HIGH HIGH LOW OFF /MONO /MONO INPUT1 FROM AMPLIFIER INPUT1 FROM AMPLIFIER OUTPUT TO SPEAKERS OUTPUT TO SPEAKERS SPLIT SUBWOOFER POWER POWER ON ON OFF OFF Amplifier To AC outlet To AC outlet Notes ● If your amplifier has two sets of PRE OUT terminals, you can connect the subwoofer to one of those PRE OUT terminals. ● When connecting to a monaural line output terminal of the amplifier, connect the L/MONO INPUT2 terminal. E-5  Connecting to speaker output terminals of the amplifier 䡵 Using one subwoofer If your amplifier has only one set of main speaker output terminals Connect the speaker output terminals of the amplifier to the INPUT1 terminals of the subwoofer, and connect the OUTPUT terminals of the subwoofer to the main speakers. Left main speaker Right main speaker Subwoofer VOLUME 0 AUTO STANDBY 10 HIGH HIGH CUT LOW HIGH LOW OFF INPUT2 Speaker output terminals /MONO INPUT1 FROM AMPLIFIER INPUT1 OUTPUT FROM AMPLIFIER TO SPEAKERS POWER ON OFF OUTPUT TO SPEAKERS Amplifier To AC outlet If your amplifier has two sets of speaker output terminals Subwoofer Right main speaker Left main speaker VOLUME 0 AUTO STANDBY 10 HIGH HIGH CUT LOW HIGH LOW OFF INPUT2 /MONO INPUT1 FROM AMPLIFIER OUTPUT INPUT1 TO SPEAKERS FROM AMPLIFIER POWER ON OFF OUTPUT TO SPEAKERS To AC outlet A B Speaker output terminals E-6 Amplifier (Both A and B speaker outputs must be ON.)  English 䡵 Using two subwoofers Connect the speaker output terminals of the amplifier to the INPUT1 terminals of the subwoofer, and connect the OUTPUT terminals of the subwoofer to the main speakers. Left main speaker Right main speaker Left subwoofer Right subwoofer VOLUME VOLUME 0 AUTO STANDBY 0 10 HIGH AUTO STANDBY HIGH CUT LOW HIGH LOW OFF INPUT2 INPUT2 10 HIGH HIGH CUT LOW HIGH LOW OFF /MONO /MONO INPUT1 INPUT1 FROM AMPLIFIER FROM AMPLIFIER OUTPUT TO SPEAKERS INPUT1 INPUT1 FROM AMPLIFIER FROM AMPLIFIER OUTPUT TO SPEAKERS POWER POWER ON ON OFF OFF OUTPUT OUTPUT TO SPEAKERS TO SPEAKERS To AC outlet To AC outlet Amplifier Speaker output terminals Connecting to the INPUT1/OUTPUT terminals of the subwoofer For connections, keep the speaker cables as short as possible. Do not bundle or roll up the excess part of the cables. If the connections are faulty, no sound will be heard from the subwoofer or the speakers, or both of them. Make sure that the + and – polarity markings of the speaker cables are observed and set correctly. If these cables are reversed, the sound will be unnatural and lack bass. Caution Do not let the bare speaker wires touch each other as this could damage the subwoofer or the amplifier, or both of them. How to Connect: Red: positive (+) Black: negative (–) ➀ ➁ ➂ 1 Press and hold the terminal’s tab, as shown in the figure. 2 Insert the bare wire end properly into the terminal hole. [Remove approx. 10 mm (3/8”) insulation from the speaker cable.] 3 Release your finger from the tab to allow it to lock securely on the cable’s wire end. 4 Test the firmness of the connection by pulling lightly on the cable at the terminal. E-7  CONTROLS AND THEIR FUNCTIONS Front panel SUBWOOFER SYSTEM YST-SW005 YST SW005 1 Port Rear panel VOLUME 8 VOLUME 0 AUTO STANDBY POWER 2 10 HIGH 0 ON INPUT2 OFF 10 HIGH CUT LOW HIGH LOW OFF /MONO AUTO STANDBY 4 HIGH LOW OFF HIGH HIGH CUT LOW 9 INPUT1 FROM AMPLIFIER 5 OUTPUT TO SPEAKERS 3 220V-240V POWER 110V-120V 2 3 E-8 6 INPUT1 FROM AMPLIFIER VOLTAGE SELECTOR 220V-240V 1 /MONO ON OFF 110V-120V INPUT2 VOLTAGE SELECTOR Power indicator Lights up GREEN when the POWER switch (2) is pressed in to the ON position and goes off when set to the OFF position. * Standby mode If the POWER switch (2) is pressed in to the ON position and the AUTO STANDBY switch (4) is set to the HIGH or LOW position, this indicator lights up RED when no signal is received by the subwoofer. POWER switch Press this switch to the ON position to turn on the power of the subwoofer. When the power of the subwoofer is on, the power indicator (1) on the front panel lights up GREEN. Press this switch again to set to the OFF position to turn off the power of the subwoofer. VOLTAGE SELECTOR switch (China and General model only) 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. 7 4 5 6 7 8 9 OUTPUT TO SPEAKERS 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 explained on page 9. 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 switch (2) is in the OFF position. INPUT2 terminals Used to input line level signals from the amplifier. INPUT1 (FROM AMPLIFIER) terminals Used to connect the subwoofer with the speaker terminals of the amplifier. OUTPUT (TO SPEAKERS) terminals Can be used for connecting to the main speakers. Signals from the INPUT1 terminals (6) are sent to these terminals. VOLUME control Adjusts the volume level. Turn the control clockwise to increase the volume, and counterclockwise to decrease the volume. HIGH CUT (HIGH/LOW) switch Selects the high frequency cut off point. Normally, it is set to LOW, however, you may set to HIGH if necessary. Refer to page 10.  If the source being played is stopped and the input signal is cut off for 7 to 8 minutes, the subwoofer automatically switches to the standby mode. (When the subwoofer switches to the standby mode by the automatic 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 will operate by sensing a certain level of low frequency input signal. Usually set the AUTO STANDBY switch to the LOW position. However, if the power is not switched to ON or STANDBY smoothly, set the switch to the HIGH position. In the HIGH position, the power will turn on even with a low level of input signal. But please be aware that the subwoofer may not switch to the standby mode when there is an extremely low input signal. * The power might turn on unexpectedly by sensing noise from other appliances. If that occurs, set the AUTO STANDBY switch to the OFF position and use the POWER switch to switch the power between ON and OFF 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. English AUTOMATIC POWER-SWITCHING FUNCTION This function is available only when the power of the subwoofer is on (by pressing the POWER switch). E-9  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. Rear panel VOLUME 1, 6 VOLUME 0 AUTO STANDBY 10 HIGH 0 10 HIGH CUT LOW HIGH LOW OFF AUTO STANDBY INPUT2 HIGH LOW OFF /MONO HIGH HIGH CUT LOW 5 INPUT1 FROM AMPLIFIER OUTPUT TO SPEAKERS INPUT2 /MONO POWER 3 ON POWER ON OFF INPUT1 FROM AMPLIFIER OFF OUTPUT TO SPEAKERS 1 2 Set the VOLUME control to minimum (0). 3 Press the POWER switch to the ON position. Turn on the power of all the other components. * The power indicator on the front panel 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 Set the HIGH CUT switch to the LOW or HIGH position. This subwoofer is designed so that the optimum tone balance between the subwoofer and the main speakers is obtained when this switch is set to the LOW position. The tone balance may change, however, depending on the room size, the distance from the subwoofer to the main speakers, and so on. If necessary, switch it to the HIGH position. E-10 6 Increase the volume gradually to adjust the volume balance between the subwoofer and the main speakers. Normally, set the control to the level where you can obtain a little more bass effect than when this unit is not used. If the desired response cannot be obtained, adjust the HIGH CUT switch and the VOLUME control again. Notes ● 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 and the HIGH CUT switch, refer to “Frequency characteristics” on page 11.  English 䡵 Frequency characteristics 100 Fig. 1 shows the frequency characteristics of the subwoofer with each position (HIGH/LOW) of the HIGH CUT switch. HIGH CUT HIGH 90 80 70 HIGH CUT LOW 60 50 40 20 50 100 200 500Hz Fig. 1 Fig. 2 shows the optimum volume level with the HIGH CUT switch at the HIGH position, and the frequency characteristics when the subwoofer is combined with a typical 3.5” or 4” (8 cm or 10 cm) acoustic suspension, 2 way system main speakers. 100 VOLUME 90 80 70 0 YST-SW005 I0 60 HIGH LOW 50 HIGH CUT 40 20 Main speaker’s response 50 100 200 500Hz Fig. 2 E-11  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. Air woofer (Helmholtz resonator) Cabinet High-amplitude bass sound Port Advanced Negativeimpedance Converter Active Servo Processing Amplifier Signals of low amplitude E-12 Signals  English 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 cord and contact your authorized YAMAHA dealer or service center. Problem Cause What to Do Power is not supplied even though the POWER switch is set to the ON position. The power plug is not securely connected. Connect it securely. No sound. The VOLUME control is set to 0. Turn the VOLUME control to the right (clockwise). Speaker cables are not connected securely. Connect them securely. Speaker cables are not connected correctly. Connect them correctly, that is L (left) to L, R (right) to R, “+” to “+” and “–” to “–”. A source sound with few bass frequencies is played. Play a source sound with bass frequencies. Set the HIGH CUT switch to the “HIGH” position. It is influenced by standing waves. Reposition the subwoofer or break up the parallel surface by placing bookshelves etc. along the walls. The POWER switch is set to the OFF position. Set the POWER switch to the ON position. The AUTO STANDBY switch is set to the OFF position. Set the AUTO STANDBY switch to the “HIGH” or “LOW” position. The level of input signal is too low. Set the AUTO STANDBY switch to the “HIGH” position. There is an influence of noise generated from external appliances etc. 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. The AUTO STANDBY switch is set to the OFF position. Set the AUTO STANDBY switch to the “HIGH” position. The subwoofer turns into the standby mode unexpectedly. The level of input signal is too low. Set the AUTO STANDBY switch to the “HIGH” position. The subwoofer turns on unexpectedly. There is an influence of noise generated from external appliances etc. 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. Sound level is too low. The subwoofer does not turn on automatically. The subwoofer does not turn into the standby mode automatically. E-13  SPECIFICATIONS Type .............. Advanced Yamaha Active Servo Technology Driver ....................................... 16 cm (6-1/2”) cone woofer Magnetic shielding type Amplifier Output USA and Canada models .................................. 55 W/5Ω Other models ..................................................... 50 W/5Ω Frequency Response .............................. 30 Hz to 200 Hz Power Supply USA and Canada models ....................... AC 120V, 60 Hz U.K. and Europe models ........................ AC 230V, 50 Hz Australia model ....................................... AC 240V, 50 Hz China and General models ....................................... AC 110-120/220-240V, 50/60 Hz E-14 Power Consumption ................................................. 60 W (In the standby mode: 0.8 W) Dimensions (W x H x D) ..... 200 mm x 365 mm x 375 mm (7-7/8” x 14-7/20” x 14-3/4”) Weight ............................................. 8.5 kg (18 lbs. 11 oz.) Accessories .............................................. Nonskid pad x 4 * Please note that all specifications are subject to change without notice.  YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA YAMAHA 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, 25462 RELLINGEN, BEI HAMBURG, F.R. OF GERMANY ELECTRONIQUE FRANCE S.A. RUE AMBROISE CROIZAT BP70 CROISSY-BEAUBOURG 77312 MARNE-LA-VALLEE CEDEX02, 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 VASTRA FRÖLUNDA, SWEDEN MUSIC AUSTRALIA PTY, LTD. 17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA Printed in China V848090