The impulse 5C two-way speaker system is a lightweight-yet-rugged molded sound Reinforcement enclosure. Designed for install applications, these weather resistant speakers are ideal for music playback or speech. These units are compatible with 100V, 70V or standard 8 Ohm inputs. For 100V, 70V transformer operation there are selectable power levels. For 100V setting, there is a 30W, 20W, 10W, and 5W tap selection.