The Impulse 8c 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 30W (15W), 20W (10W), 10W (5W) and 5W( 2.5W ) tap selection.