iiiThank you for selecting this YAMAHA subwoofer system.Please read the following operating precautionsbefore use. YAMAHA will not be held responsiblefor any damage and/or injury caused by notfollowing the cautions below.• To assure the finest performance, please read thismanual carefully. Keep it in a safe place for futurereference.• Install this unit in a cool, dry, clean place - away fromwindows, heat sources, sources of excessive vibration,dust, moisture and cold. Avoid sources of humming(transformers, motors). To prevent fire or electricalshock, do not expose this unit to rain or water.• Never open the cabinet. If something drops into the set,contact your dealer.• The voltage to be used must be the same as that specifiedon the rear panel. Using this unit with a higher voltagethan specified is dangerous and may cause a fire and/orelectric shock.• To reduce the risk or fire or electric shock, do not exposethis unit to rain or moisture.• Do not use force on switches, controls or connectionwires. When moving the unit, first disconnect the powerplug and the wires connected to other equipments.Never pull the wires themselves.• When not planning to use this unit for a long period (ie.,vacation, etc.), disconnect the AC power plug from thewall outlet.• Since this unit has a built-in power amplifier, heat willradiate from the rear panel. Place the unit apart from thewalls, allowing at least 20 cm of space above, behind andon both sides of the unit to prevent fire or damage.Furthermore, do not position with the rear panel facingdown on the floor or other surfaces.• Do not cover the rear panel of this unit with a newspaper,a tablecloth, a curtain, etc. in order not to obstruct heatradiation. If the temperature inside the unit rises, it maycause fire, damage to the unit and/or personal injury.• Do not place the following objects on this unit:- Glass, china, small metallic etc.If glass etc. falls by vibrations and breaks, it may causebodily injury.- A burning candle etc.If the candle falls by vibrations, it may cause fire andbodily injury.- A vessel with water in itIf the vessel falls by vibrations and water spills, it maycause damage to the speaker, and/or you may get anelectric shock.• Do not place this unit where foreign objects such aswater drips might fall. It might cause a fire, damage tothis unit, and/or personal injury.• Never put a hand or a foreign object into the YST portlocated on the right side of this unit. When moving thisunit, do not hold the port as it might cause personalinjury and/or damage to this unit.• Never place a fragile object near the YST port of thisunit. If the object falls or drops by the air pressure, it maycause damage to the unit and/or personal injury.• Never open the cabinet. It might cause an electric shocksince this unit uses a high voltage. It might also causepersonal injury and/or damage to this unit.• When using a humidifier, be sure to avoid condensationinside this unit by allowing enough spaces around this unitor avoiding excess humidification. Condensation mightcause a fire, damage to this unit, and/or electric shock.• Super-bass frequencies reproduced by this unit maycause a turntable to generate a howling sound. In such acase, move this unit away from the turntable.• This unit may be damaged if certain sounds arecontinuously outputted at high volume level. Forexample, if 20 Hz-50 Hz sine waves from a test disc,bass sounds from electronic instruments, etc. arecontinuously outputted, or when the stylus of a turntabletouches the surface of a disc, reduce the volume level toprevent this unit from being damaged.• If you hear distorted noise (i.e., unnatural, intermittent“rapping” or “hammering” sounds) coming from thisunit, reduce the volume level. Extremely loud playing ofa movie soundtrack’s low frequency, bass-heavy soundsor similarly loud popular music passages can damagethis speaker system.• Vibration generated by super-bass frequencies maydistort images on a TV. In such a case, move this unitaway from the TV set.• Do not attempt to clean this unit with chemical solventsas this might damage the finish. Use a clean, dry cloth.• Be sure to read the “TROUBLESHOOTING” sectionregarding common operating errors before concludingthat the unit is faulty.• Install this unit near the wall outlet and where the ACpower plug can be reached easily.• Secure placement or installation is the owner’sresponsibility. YAMAHA shall not be liable for anyaccident caused by improper placement orinstallation of speakers.CAUTION: Read this before operating your unitThis unit features a magnetically shielded design, butthere is still a chance that placing it too close to a TV setmight impair picture color. Should this happen, movethis unit away from the TV set..As long as this unit is connected to the AC wall outlet, itis not disconnected from the AC power source even ifyou turn off this unit by POWER.