UB YST-SW325 Subwoofer System OWNER’S MANUAL
IMPORTANT SAFETY INSTRUCTIONS 1 Read these instructions. 2 Keep these instructions. 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.
FCC INFORMATION (for US customers) We Want You Listening For A Lifetime 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.
Thank you for selecting this YAMAHA subwoofer system. CAUTION: Read this before operating your unit Please read the following operating precautions before use. YAMAHA will not be held responsible for any damage and/or injury caused by not following the cautions below. • To assure the finest performance, please read this manual carefully. Keep it in a safe place for future reference.
• VOLTAGE SELECTOR (Asia and General models only) The voltage selector switch on the rear panel of this unit must be set for your local main voltage BEFORE plugging this unit into the AC main supply. Voltages are 110-120/220-240 V AC, 50/60 Hz. Standby mode When this unit is set in standby mode by pressing the STANDBY/ON button on the control panel, this unit consumes a small amount of power. This state is called the standby mode.
FEATURES • This subwoofer system employs Advanced Yamaha Active Servo Technology II which Yamaha has developed for reproducing higher quality super-bass sound. (Refer to page 14 for details on Advanced Yamaha Active Servo Technology II.) 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.
PLACEMENT The position of the subwoofer is not so critical since low bass sounds are not highly directional. For a sonorous sound field, although you can obtain a good effect with one subwoofer, the use of two subwoofers is recommended. If using one subwoofer, we recommend that you place it on the outside of either the right or the left front speaker. (See fig. A .) If using two subwoofers, we recommend that you place them on the outside of each front speaker. (See fig. B .) The placement shown in fig.
CONNECTIONS Choose one of the following two connecting methods that is more suitable for your audio system. Choose Choose 1 2 (pages 4-5) if your amplifier has line output (pin jack) terminal(s) (pages 6-7) if your amplifier has no line output (pin jack) terminal Caution: Do not connect the power cord of the subwoofer and other components into an AC outlet until all connections between components are completed.
CONNECTIONS ■ Using one subwoofer Subwoofer Mono pin cable (not included) OUTPUT TO SPEAKERS AUTO STANDBY INPUT 2 HIGH LOW OFF OUTPUT INPUT 2 TO SPEAKERS PHASE L /MONO L /MONO NORM REV R INPUT 1 FROM AMPLIFIER VOLTAGE SELECTOR 220V-240V POWER ON 110V-120V OFF INPUT 1 R FROM AMPLIFIER Audio pin cable (not included) To AC outlet Amplifier ■ Using two subwoofers Mono pin cable(not included) OUTPUT TO SPEAKERS INPUT 2 OUTPUT TO SPEAKERS L /MONO INPUT 1 L /MONO R INPUT 1 FROM
CONNECTIONS Connecting to speaker output terminals of the amplifier 2 Select this method if your amplifier has no line output (pin jack) terminal. If your amplifier has two sets of front speaker output terminals and both terminals can output sound signals simultaneously. • Connect one set of front speaker output terminals of the amplifier to the INPUT1 terminals of the subwoofer, and connect the other set of front speaker output terminals of the amplifier to the front speakers.
CONNECTIONS If your amplifier has only one set of front 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 front speakers.
CONNECTIONS Connecting to the INPUT1/OUTPUT terminals of the subwoofer ■ Before connecting Plug in the subwoofer to the AC outlet After all connections are completed, plug in the subwoofer and other audio/video components to the AC outlet. Remove the insulation coating at the extremity of each speaker cable by twisting the coating off.
CONTROLS AND THEIR FUNCTIONS Advanced 1 23 4 5 6 Control panel Top Front panel 9 AUTO STANDBY 8 HIGH LOW OUTPUT TO SPEAKERS INPUT 2 PHASE OFF L /MONO NORM REV INPUT 1 AUTO STANDBY R FROM AMPLIFIER HIGH LOW OFF OUTPUT TO SPEAKERS INPUT 2 0 PHASE L /MONO NORM REV INPUT 1 R A B FROM AMPLIFIER VOLTAGE SELECTOR 220V-240V VOLTAGE SELECTOR 220V-240V 110V-120V POWER ON OFF POWER ON 110V-120V OFF C Rear panel (General model) 7 1 POWER INDICATOR Lights up in green while the su
CONTROLS AND THEIR FUNCTIONS 5 HIGH CUT control Adjusts the high frequency cut off point. Frequencies higher than the frequency selected by this control are all cut off (and no output). * One graduation of this control represents 10 Hz. 6 VOLUME control Adjusts the volume level. Turn the control clockwise to increase the volume, and counterclockwise to decrease the volume. 7 POWER switch Normally, set this switch to the ON position to use the subwoofer.
AUTO STANDBY FUNCTION The subwoofer automatically places itself in the standby mode if it does not receive an input signal for 7 or 8 minutes. (The power indicator lights in red.) This is called AUTO STANDBY function. When the subwoofer detects a bass signal input of below 200 Hz, it automatically places itself on. (The power indicator lights in green.) Activate the AUTO STANDBY function 1 2 3 Press the STANDBY/ON button to set the subwoofer in the standby mode. (The power indicator goes off.
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 front speakers by following the procedures described below. 7 3 NORM REV 3 1 2 3 8 5 Set the VOLUME control to minimum (0). Turn on the power of all the other components. Make sure that the POWER switch is set to the ON position, then press the STANDBY/ON button to turn on the subwoofer. * The Power indicator lights up in green.
ADJUSTING THE SUBWOOFER BEFORE USE Frequency characteristics This subwoofer’s frequency characteristics dB HIGH CUT 90 Hz 90 HIGH CUT 150 Hz 80 70 60 50 40 20 HIGH CUT 50 Hz 50 100 200 500Hz Frequency response graph* The figures below show the optimum adjustment of each control and the frequency characteristics when this subwoofer is combined with a typical front speaker system. ■ EX.
ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II In 1988, Yamaha brought to the marketplace speaker systems utilizing YST (Yamaha Active Servo Technology) to give powerful, high quality bass reproduction. This technique uses a direct connection between the amplifier and speaker, allowing accurate signal transmission and precise speaker control. Yamaha’s newly developed Advanced YST II adds many refinements to Yamaha Active Servo Technology, allowing better control of the forces driving the amplifier and speaker.
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 STANDBY/ON button is set to the ON position. The power plug is not securely connected. Connect it securely. The POWER switch is set to the OFF position.
SPECIFICATIONS Type...... Advanced Yamaha Active Servo Technology II Power Consumption................................................70 W Driver ..........................................20 cm (8”) cone woofer Magnetic shielding type Standby Power Consumption ...............................0.5 W Amplifier Output (100 Hz, 5 ohms, 10% THD) ................................................................................ 150 W Dimensions (W x H x D) .......................................
