Bogen"s CSD2X2L(U) Drop-In Ceiling Speakers are 8-ohm, full-range speakers that allow for fast and easy installation, which saves installation time, effort, and cost. The CSD2X2L(U) is a 2" x 2" speaker that fits perfectly into place in 2" x 2" ceiling grids - without needing to cut ceiling tiles or requiring the use of tile support rails. The CSD2X2L(U) can also be easily installed in 2" x 4" ceiling grids - just make one cut to the ceiling tile, position the support rail, and drop the speaker into place.