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Retain this manual for future reference. 2. The subwoofer should be placed at a ventilated, dry and cool location, away from any heat sources such as radiators or amplifiers. Do not obstruct the amplifier in the C-11 from ventilation. It is necessary that air can flow around the finned heat sink on the rear panel of the amplifier. 3. Do not use the subwoofer near water or expose it to rain or moisture. 4. Always unplug the power cord first when making connections. Switch power on only after y