Boston Acoustics Voyager VOYA4B 4.25-Inch 2-Way Outdoor Speakers (Black) Two-way, high-performance outdoor loudspeakers are specially voiced for open-air environments 4.5" copolymer woofer .75" Kortec soft dome tweeter delivers a smooth and natural high-frequency response Enclosures, grilles, hardware, cones, surrounds and gaskets stand up to weather and temperature extremes Recommended amplifier power: 15-100 Watts