Bogen s CSD1X2NB Drop-In Ceiling Speakers are full-range speakers that allow for fast and easy installation. Just make one simple cut to the ceiling tile, lay the support rail crossbar (included) across the ceiling grid, and drop the speaker into place. Finely perforated grille over the entire front of speaker Fully enclosed, industrial grade steel construction Exposed driver without back can 8'' wide range loudspeaker Seismic attachment point 70V/25V, 4-watt transformer (4, 2, 1, 0.5, 0.25, 0.125 watt) taps; selected by stripped & tinned leads Available in off-white and bright white ( U versions) grille finish ''VR'' versions have a Recessed Volume Control (front-mounted) Support Rail Crossbar (included)