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. Adjustable Tweeter Output Level: The Club 64 and Club 64C, Club 64CTP component systems offer a tweeter output level control of 0dB or +3dB to optimize system linearity based on installation location. 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. Starfish Tweeter Mounting Adapter: The Club 64C, Club 64CTP component Speaker system come with the Starfish tweeter mounting adapter. The Starfish tweeter mounting adapter allows for installation of the tweeter behind factory grilles & other locations.