Club 54F. Newly engineered drivers combine a compact, easy-to-fit form factor with exceptionally high sensitivity making them suited to factory upgrades in addition to full blown aftermarket systems. Plus One™ Woofer Cone Architecture Patented (US patent #7,548,631) Plus One™ cones provide more overall speaker-cone area than other speakers for the same size, resulting in higher sensitivity, increased low-frequency output and greater musical character. Acoustically Damped, UV-resistant Polypropylene Cone Every Club speaker's woofer cone is built to deliver clean, non-resonant sound quality, while standing up to the demanding heat and humidity of the car environment. Edge-driven Silk Dome Tweeter The Club 54F feature a full, edge-driven silk dome tweeter, which provides a broader and smoother high frequency response, never-harsh regardless of output level than more commonly used w-domes. Bigger Magnet, Bigger Power Handling The new Club lineup includes a larger magnet providing higher power handling than competitors at similar price points. Includes: Power Handling: 45W RMS, 135W peak Sensitivity (@ 2.83V): 91dB Frequency Response: 75Hz – 20kHz Nominal Impedance: 3.0 ohms *By request/order.