MB Quart Premium PVI164 6.5" Add a Woofer for Premium Crossover Speakers 6.5" Add-A-Woofer for Premium Crossover Speakers with 70-140 Watt Power Rating and 38Hz-280Hz Frequency (Sold in Pairs) Includes 40mm WideSphere tweeter assembly that fully addresses the inherent speaker problem of directional sound dispersion in a vehicle - making every seat, the best seat Aluminum-coated phase plug, magnet heat sink cup for voice coil cooling and separate off-coaxial mounting configurations Premium performance crossover with three-level tweeter attenuation Two-piece carbon-fiber reinforced composite chassis and polypropylene cone with edge-wound 1 voice coils and gold-plated connection terminals for the best possible signal transfer