WHD UP-6-8, 6 cm-Broad band ceiling speaker system, 6/8 W, 8 Ohms, 150-18.000 Hz, RAL 9016 white or RAL 9005 black, without transformer, mounted with spring clamps, impregnated membrane, dimensions: outside dia. 100mm, mounting depth 42mm, cutout 93mm, weight 0,4kg. Comments: very light-weight, tool-free mounting, size is the same as industry standard sunken halogen ceiling lamps, therefore highly compatable.