User manual YAMAHA SW-2

[. . . ] Active Servo Processing Subwoofer System SW-2 Active Servo Technology Enceinte pour très basses fréquences de traitement à asservissement actif Thank you for selecting this YAMAHA Subwoofer System. Nous vous remercions d'avoir porté votre choix sur cette enceinte pour très basses fréquences YAMAHA. OWNER'S MANUAL MODE D'EMPLOI SAFETY INSTRUCTIONS 7 CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN 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. [. . . ] FOR CANADIAN CUSTOMER THIS CLASS B DIGITAL APPARATUS MEETS ALL REQUIREMENTS OF THE CANADIAN INTERFERENCE-CAUSING EQUIPMENT REGULATIONS. 3. 9. The apparatus is not disconnected from the AC power source as long as it is connected to the wall outlet, even if the apparatus itself is turned off. 10. Super-bass frequencies reproduced by this unit may cause a 11. As this speaker contains strong magnet, avoid placing watches, magnetic tapes, etc. Also, placing the speaker near a TV set may impair picture color. If this happens, move the TV set away from the speaker. 12. 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. 13. This unit has a port called "air woofer" which is for reproducing a super-bass sound. Be careful not to put a hand or some objects into the port, otherwise it may give you an electric shock or give this unit a damage, or cause a fire. 4 English 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. 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) Use the rubber pads Put the provided rubber pads at the four corners on the bottom of this unit to prevent this unit moving due to vibrations etc. 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. One subwoofer will have a good effect on your audio system, however, the use of two subwoofers is recommended to obtain more presence. 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. [. . . ] 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. [. . . ]