[. . . ] These active loudspeaker enclosures are fitted with a stereo amplifier, thus allowing you to reproduce the sound of any portable or pocket cassette or CD player, radio or other set simply by connecting the active speakers to the earphone jack of the latter. [. . . ] The switch fitted on the front side @ allows you to activate the low tones (Fig. Make sure that your home mains voltage complies with the voltage indicated on the identification plate. Protect the enclosures against any heat source (fire place) and any equipment creating powerful electromagnetic fields (loudspeakers, etc. When you take your equipment into a heated room after it has remained in a cold environment (example: transport in winter), wait until the condensation moist has disappeared before putting the equipment into operation. In the event of malfunction of your equipment, disconnect it from the mains for a moment. Your equipment was not designed for professional operation, but for home use only. Neither should you open the housing yourself nor remove any of the internal parts, as this might damage some fragile components and expose you to dangerous shock voltage. When not using your loudspeaker enclosures for a long period of time, we recommend that you remove the batteries. [. . . ] Note: Instead of batteries, you can also use the external AC/DC adapter (DC 9 V), included, to be connected to jack 6. [. . . ]