Atlas SD722W 8" Speaker/Baffle, (70.7/25V) 2 Watt Transformer BLAtlas SD722W 8" Speaker Baffle, (70. 7 25V) 2 Watt Transformer (White) The new SD722W combines a world renowned Atlas 8" commercial duty loudspeaker with the industry's most accepted grille design to create a very aggressively priced ceiling speaker solution. Fully Capable SD722W is a 2 watt, 8" loudspeaker with a 5 oz ceramic magnet. It includes a treated paper cone for lower harmonic distortion. It also includes factory installed 25 70. 7V line