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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 English Frequency characteristics Fig. 1 shows the frequency characteristics of the subwoofer with each position (HIGH/LOW) of the HIGH CUT switch. 90 100 80 70 60 50 40 20 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. VOLUME 80 90 100 70 0 I0 60 HIGH CUT LOW HIGH 40 50 20 HIGH CUT LOW HIGH CUT HIGH 50 100 200 500Hz Fig. 1 YST-SW005 Main speaker’s response 50 100 200 500Hz Fig. 2 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, low- frequency 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. High-amplitude bass sound Cabinet Port Air woofer (Helmholtz resonator) Active Servo Processing Amplifier Signals Signals of low amplitude Advanced Negative- impedance Converter 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. English 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. Sound level is too low. 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 subwoofer does not turn on automatically. 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 STAND...