Engineered for applications with limited plenum space. Incorporates a SoundTube-specific shallow backcan with an installed depth of 3.5inches. One 5.25inch (134mm) polypropylene woofer with rubber surround and one 0.75inch (19mm) silk dome tweeter. BroadBeam Ring™ technology for mid-range clarity and smooth off axis performance. Easy-access six-position tap switch for 25/70.7/100volt and transformer bypass settings allows for easy ordering, stocking and installation. Tuned port on baffle for added musicality and bass response down to 65Hz (-10dB). Reduced amplification costs and maximum efficiency of 84.5dB sensitivity, 16ohm impedance. Incorporates a painted steel grille for lasting durability. Adaptable to material thicknesses ranging from 0.035inch (0.9mm) to 1.6inch (40.6mm). UL 1480 and 2043 listed.