WHD UP 26-8, 20 cm-2-Way (coax) ceiling speaker system, 25/35 W, 8 Ohm, 50-18.000 Hz, RAL 9016 white, without transformer, incl. mounting material for ceiling thickness 1 to 20 mm, impregnated membrane. dimensions: outside dia. 260mm, mounting depth 85mm, cutout 230mm, weight 1,6kg. Comments: High quality low freq. response, light weight , tool free mounting through clamp technology.