OutBack Two-Way Indoor/Outdoor Speakers The OutBack indoor/outdoor speakers provide rugged, versatile, weatherproof, high-quality sound anywhere. OutBack speakers are engineered with water-resistant, weather-tight cabinets, and feature specially-selected drivers capable of withstanding rain, snow, heat, salt water and the sun's UV rays. OutBack speakers can withstand extreme temperatures they have been baked at 200°F and frozen at -50°F. The low-resonance Polypropylene cabinet coupled with high-quality hardware, and gold-plated binding posts form a handsome solid speaker. The OutBacks are truly both indoor and outdoor speakers. The sturdy wall-mount brackets are useful for both indoor and outdoor placement, but the OutBacks also have built-in feet making it at home as a free-standing speaker. OutBack weatherproof speakers all come complete with marine-grade mounting hardware.