YST-SW225UB.
YST-SW225UB.book Page i Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page ii Tuesday, July 27, 2004 10:25 AM 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.
0102YST-SW225_UB_safety_en.fm Page iii Monday, August 21, 2006 4:01 PM 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.
0103YST-SW225_UB_en.toc Page 1 Monday, August 21, 2006 4:06 PM • 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. This unit is not disconnected from the AC power source as long as it is connected to the wall outlet, even if this unit itself is turned off.
YST-SW225UB.book Page 2 Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page 3 Tuesday, July 27, 2004 10:25 AM PLACEMENT One subwoofer will have a good effect on your audio system, however, the use of two subwoofers is recommended to obtain more effect. A If using one subwoofer, it is recommended to place it on the outside of either the right or the left front speaker. (See fig. A .) If using two subwoofers, it is recommended to place them on the outside of each front speaker. (See fig. B .) The placement shown in fig.
YST-SW225UB.book Page 4 Tuesday, July 27, 2004 10:25 AM CONNECTIONS Choose one of the following two connecting methods that is more suitable for your audio system. ■ Choose 1 ■ Choose 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: Unplug the subwoofer and other audio/video components before making connections.
YST-SW225UB.
YST-SW225UB.book Page 6 Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page 7 Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page 8 Tuesday, July 27, 2004 10:25 AM CONNECTIONS Connecting to the INPUT1/OUTPUT terminals of the subwoofer For connection, 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.
YST-SW225UB.
YST-SW225UB.book Page 10 Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page 11 Tuesday, July 27, 2004 10:25 AM AUTOMATIC POWER-SWITCHING FUNCTION This function automatically switches the unit between standby and power-on modes. The subwoofer automatically places itself in standby mode if it does not receive an input signal for 7 or 8 minutes. (The power indicator lights red.) When the subwoofer detects a bass signal input of below 200 Hz, it automatically places itself in power-on mode. (The power indicator lights green.
YST-SW225UB.book Page 12 Tuesday, July 27, 2004 10:25 AM 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 1 Set the VOLUME control to minimum (0). 8 Turn on the power of all the other components.
YST-SW225UB.book Page 13 Tuesday, July 27, 2004 10:25 AM ADJUSTING THE SUBWOOFER BEFORE USE Frequency characteristics This subwoofer’s frequency characteristics dB HIGH CUT 90 Hz 90 HIGH CUT 140 Hz 80 70 60 50 40 20 HIGH CUT 40 Hz 50 100 200 500Hz 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.
YST-SW225UB.book Page 14 Tuesday, July 27, 2004 10:25 AM 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.
YST-SW225UB.book Page 15 Tuesday, July 27, 2004 10:25 AM 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.
0103YST-SW225_UB_en.CV4 Page 16 Friday, August 25, 2006 6:11 PM SPECIFICATIONS Type.......... Advanced Yamaha Active Servo Technology Power Consumption................................................65 W Driver ..........................................20 cm (8”) cone woofer Magnetic shielding type Standby Power Consumption ...............................0.5 W Amplifier Output (100 Hz, 5 ohms, 10% THD) ................................................................................
