Definitive Technology RCS II Rough In Bracket (Single, Silver) Single in-ceiling speaker in bracket Equipped with two 5.25-inch high-definition cast-basket bass/midrange and two 6.5-inch pressure-coupled low bass radiators Frequency response: 22Hz - 30kHz Equipped with one 1-inch pure aluminum dome tweeter Outer flange size: 15.5 W x 15.5 H inches