Features an 8" dualcone full-range driver, 97 dB, 6W transformer for use on 70V /100V distributed speaker lines, installs to in-ceiling backboxes having 4 mounting points on an 11 1/4" (286 mm) diameter mounting circle, for use with MTC-81 BB8 backcan and MTC-81 TB8 tile bridge, 13." dia. baffle x 3.5"D from back of baffle, 4" overall depth, 3 lbs., (4 Pack) white.