One full-range 4.0 in treated fiber woofer with cloth surround. Easy-access five-position tap switch for 25-, 70.7-, 100-volt and transformer bypass position plus spring terminals allow for rapid ordering, stocking and installation. Engineered for installations with limited plenum space or retrofit applications. Reduced amplification costs and maximum efficiency with 88.5 dB sensitivity and 8 ohm impedance. Superior voice intelligibility with an average coverage angle of 110°. Fits standard 8-inch backcans for retrofits.