SELENIUMD250XHDD250XHD 2-Inch Phenolic Driver, Set of 1 nominal impedance- 8 w minimum impedance at 615 hz/7.2 w power using crossover (12db/oct) active passive frequency response at -10 db/400 to 9,000 hz throat diameter 25 (1) mm (in) carton dimensions (w x d x h) . 41 x 30.5 x 10 (16.1 x12 x 4) cm (inches)