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Also save your bill of sale, as it may be required for warranty service. CAUTION: Please ensure that the correct plug is used on your AC outlet. CLEANING - Unplug the AR subwoofer from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. ATTACHMENTS - Do not place the AR Subwoofer on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing serious injury to a child or adult, and serious damage to the product. The ideal location for your AR subwoofer is the floor. VENTILATION - Slots and openings in the AR Subwoofer are provided for ventilation, to ensure reliable operation and to protect it from overheating, these openings must not be blocked by placing the product on a bed, sofa rug, or other similar surface. The AR Subwoofer should not be placed in a built in installation such as a bookcase or rack unless proper ventilation is provided or Acoustic Research’s instructions have been adhered to. POWER SOURCES - The AR Subwoofer should be operated only from the type of power source indicated on the marking label. If you are not sure of power supply to your home, consult your Acoustic Research dealer or local power company. GROUNDING OR POLARIZATION - The AR Subwoofer may be equipped with a polarized alternating-current line plug (a plug having one blade wider than the other). This plug will fit into the power outlet only one way . This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug is still unable to fit, contact your electrician to replace your obsolete outlet. POWER-CORD PROTECTION - Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the Subwoofer. LIGHTNING - For added protection for the AR Subwoofer during a lightning storm, or when left unattended and unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the AR Subwoofer due to a lightning and power-line surges. OVERLOADING - Do not overload wall outlets, extension cords, or integral convenience receptacles as this can result in a risk of fire or electric shock. OBJECT AND LIQUID ENTRY - Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind on the AR Subwoofer. SERVICING - Do not attempt to service the AR subwoofer yourself as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified Acoustic Research service personnel. DAMAGE REQUIRING SERVICE - Unplug the AR subwoofer from the wall outlet and refer servicing to qualified service personnel under the following conditions: A. When the power-supply cord or plug is damaged. B. If liquid has been spilled, or objects have fallen into the product. C. If the product has been exposed to rain or water. D. If the product does not operate normally by following the operating instructions. Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the AR subwoofer to its normal operation. E. If the AR subwoofer has been dropped or damaged in any way. F. When the product exhibits a distinct change in a performance - this indicates need for service. REPLACEMENT PARTS - When replacement parts are required, be sure the service technician has used replacement parts specified by Acoustic Research or have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. SAFETY CHECK - Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. HEAT - The AR subwoofer should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat. INTRODUCTION Check your system carefully. If it has been damaged in transit, report the damage immediately by calling your Acoustic Research dealer and/or the trucking firm that delivered it. Observe all warnings and cautions. WARNING To prevent fire or shock hazard, DO NOT EXPOSE this subwoofer system to rain or excessive moisture. We recommend that you not operate your speakers or subwoofer with the bass, treble and loudness controls set to full boost. This will place undue strain on the electronics and speakers and could damage them. Whenever changing cables, pulling plugs, etc., ALWAYS TURN OFF ALL EQUIPMENT including the Subwoofer. This prevents transients from entering t...