Niles OS7.5 White (Pr) 7 Inch 2-Way High Performance Indoor Outdoor Speakers Tweeter Technology 1 tri-laminate Teteron dome with fluid-cooling and ultra-wide dispersion for clear and detailed high-frequencies Tri-laminate Teteron Dome Tweeter 1 fluid-cooled tweeter provides ultra-wide dispersion for clear, detailed and extended high-frequencies Weatherproof Engineering Enables OS loudspeakers to handle extreme hot, cold and moist environments, exceeding the military`s strict anti-corrosion specification MIL-STD-883D Low Diffraction Grille and Front Baffle Ensures that the sound waves emanating from the woofer and tweeter are not reflected by the surrounding parts of the loudspeaker for precise imaging and acoustical accuracy Inverted Gold Plated 5-Way Binding Posts Repel moisture and ensure positive connections in virtually any conditions over long periods of time