Carbon mica cones lighter & more flexible than previous models for responsiveness to low frequency range & quality sound at high volumes; Hybrid rubber & cloth surrounds with shallower edge structure for smoother oscillation at low frequency ranges; Shallower polyetherimide tweeter diaphragms for improved response for middle frequency range reproduction; Ferrite magnets; Imp: 4ohm ; Aggressive-looking grilles with wider grille ports for better acoustic structuring & minimizing sound loss; 4; 180W max; 20W RMS; Freq resp: 70Hz-20kHz; SPL: 89dB @ 1W/1m; Mounting depth: 1.78; Pair; Includes 2 grilles, two 11 lengths of speaker wire (each has female quick-slides on one end and bare wire on the other); eight 1 self-tapping screws; 8 speed clips; safety instructions, template & specifications on packaging;