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 (70v) settings, there is a 15W(7.5W), 10W(5W), 7.5W(3.75W), and 5W(2.5W) tap selection.