Niles Audio PSW8 8" SW Passive In-Wall Subwoofer: * 8" injection-molded TCC (talc, carbon and ceramic-filled) cone * Butyl rubber cone surround damps resonance and provides exceptional durability * High BL magnet structure with dual voice coils and vented pole piece insures powerful bass response * Inverted dust cap increases stiffness-to-mass ratio and reduces distortion * Baffle-mounted low pass crossover control adjusts filter settings at 100Hz or 140Hz * Baffle-mounted high pass crossover control selects filter bypass or 120Hz setting