Bogen's Model CSD2X2L is a low-impedance (8-ohm) operation Drop-In Ceiling Speaker that allow fast and simple installation, which saves time, effort, and cost. The CSD2X2L is the perfect ceiling speaker whether your ceiling grid is 2' x 2' or 2' x 4'. Alternatively, 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.