User manual KENWOOD KFC-W12

[. . . ] If the power of the amplifier is higher than the subwoofer's rated input power, increase the number of subwoofers so that the power fed to each subwoofer is lower than its rated input power, or lower the sensitivity of the amplifier. [. . . ] Dust and unstable locations -- Do not install the speakers in unstable locations or locations subject to dust. Suffocation -- After taking the unit out of the polyethylene bag, be sure to dispose of the polyethylene bag out of the reach of children. Otherwise, they may play with the bag, which could cause hazard of suffocation. Modification -- Do not attempt to open or modify the unit, for this could cause fire hazard or malfunction. Cleaning -- Do not use gasoline, naphtha, or any type of solvent to clean the speakers. Malfunction -- In the event the unit generates smoke or abnormal smell or no sound comes out from the speaker, immediately switch the power OFF. [. . . ] While the listening volume is set to a high level, do not load or eject a disc or cassette tape or operate the selector and power switches of the amplifier. [. . . ]