17 cm (6.5") ceiling speaker.. 

..with corrosion free, mat-white metal grille (RAL 9010), suitable for installation in suspended ceilings. Developed for professional 100 V sound reinforcement systems (transformer version) and domestic applications (8 ohm version). Good music reproduction and clear speech reproduction properties. Solderless level adjustment. Easy installation without screw-mounting. Including self adhesive mounting template. 

Technical Data