The Klipsch SLM-5400-C 4" Two-Way In-Ceiling Speaker consists of a 4" Cerametallic woofer with a 1" titanium-dome tweeter for full-range sound. It features a frequency response of 90 Hz to 20 kHz and a recommended amplifier power of 50W. The speaker includes square and round magnetic grilles to help you match it to nearly any décor.