Definitive Technology UIWBP/A In-Wall/Ceiling Bipolar Surround Speaker (Single, White) Single in-wall/in-ceiling rectangular bipolar built-in loudspeaker Equipped with two 5.25-inch bass/midrange drivers with non-resonant cast baskets Frequency response: 28Hz - 30kHz Equipped with two 1-inch pure aluminum dome tweeters Cut-out size: 6.13 W x 11.44 H inches