RCF DM 41 Powered Speaker.A small two-wa y speaker called the DM 41 was created for constant voltage systems. The speaker offers a natural, fluid sound reproduction that is perfect for use in indoor and outdoor background music applications as well as business music systems. The two wire cable protruding from the back of the loudspeaker is used to connect to the loudspeaker line. The enclosure comes with a wall mounting attachment and a protective perforated grille.