Plus One Woofer Cone Architecture: Patented (US patent #7,548,631) Plus One cones provide more overall speaker-cone area than other speakers of the same size, resulting in higher sensitivity, increased low-frequency output and greater musical character. Edge-driven Silk Dome Tweeter: The Club 44F, Club 54F, Club 64, Club 864F, Club 964M feature a full, edge-driven silk dome tweeter, which delivers a broader high frequency response, never-harsh regardless of output level compared to commonly used w-domes. Acoustically Damped, UV-resistant Polypropylene Cone: Every Club speaker's woofer cone is designed to deliver clean, non-resonant sound quality, while standing up to the demanding heat and humidity of the car environment. Bigger Magnet, Bigger Power Handling: The new Club lineup features a larger magnet delivering higher power handling than competitors at similar price points.