Definitive Technology UIW75 Rectangular In-Wall Speaker (Single, White) Single in-wall/in-ceiling rectangular 2-way loudspeaker Equipped with two 6.5-inch cast-basket bass/midrange drivers Frequency response: 26Hz - 30kHz Equipped with one 1-inch pure aluminum dome tweeter in a D'Appolito array Cut-out size: 6.5 W x 15.5 H inches