One 6.5 inch (165 mm) polypropylene woofer with rubber surround and one 1.0 inch (25.4 mm) silk dome tweeter. BroadBeam Ring™ technology for mid-range clarity and smooth off axis performance. Easy-access six-position tap switch for 25/70.7/100-volt and transformer bypass settings allows for easy ordering, stocking and installation. Tuned port on baffle for added musicality and bass response down to 64 Hz (-10 dB). Reduced amplification costs and maxi±Âmum efficiency of 85.0 dB sensitivity, 16 ohm impedance. Incorporates a painted steel grille for last±Âing durability. Adaptable to material thicknesses ranging from 0.035 inch (0.9 mm) to 1.6 inch (40.6 mm). UL 1480, UL 2043 and EN54-24 listed. Included accessories: Tile bridge, UL listed 0.5 inch conduit clamp, paint shield.