The CSD2X2U-V2 ceiling speaker has an 8r driver and a tap selector that allows it to be run as a W to 4W speaker at 25V or 70V. It also includes a wire that bypasses the transformer and allows the speaker to operate at 8r. The V2 version of the speaker includes a unique mounting plate to greatly expand its capabilities by allowing several of Bogenft. s Nyquist products to be mounted to the speaker