User manual YAMAHA YST-SW80

[. . . ] YST-SW 50/80 1 Active Servo Processing Subwoofer System Built-in 100W Power Amplifier (YST-SW150) Built-in 70W Power Amplifier (YST-SW80) 2 Way Selectability for Connections High Frequency Cut-off Point (HIGH CUT) Control PHASE Switch AUTO POWER ON/OFF Switch Thank you for selecting this YAMAHA Subwoofer System. Active Servo Technology CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN OWNER'S MANUAL IMPORTANT!Please record the serial number of this unit in the space below. 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. 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. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert you to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert you to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. SAFETY INSTRUCTIONS 1 2 3 4 5 Read Instructions ­ All the safety and operating instructions should be read before the unit is operated. [. . . ] The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries. We Want You Listening For A Lifetime (for US customers only) YAMAHA and the Electronic Industries Association's Consumer Electronics Group want you to get the most out of your equipment by playing it at a safe level. One that lets the sound come through loud and clear without annoying blaring or distortion ­ and, most importantly, without affecting your sensitive hearing. Since hearing damage from loud sounds is often undetectable until it is too late, YAMAHA and the Electronic Industries Association's Consumer Electronics Group recommend you to avoid prolonged exposure from excessive volume levels. 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. A newly employed AUTO POWER ON/OFF switch saves you the trouble of pressing the POWER switch when turning the power on and off. PLACEMENT A B C ( : 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 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. It also may be necessary to break up the parallel surfaces by placing bookshelves etc. along the walls. If using one subwoofer, it is recommended to place it on the outside of either the right or the left main speaker. A . ) If using two subwoofers, it is recommended to place them on the outside of each main speaker. 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 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. · 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. [. . . ] 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. [. . . ]