Metra WM-04 4 "Inch Dual Cone OEM Replacement Speaker, Black, 4.5 oz. magnet WM-04 4 inch OEM replacement speaker. This speaker is designed to replace a single OEM speaker that has been been damaged or blown. Dual cone design provides a rich sound and improves overall sound quality. Speakers are 4 ohms and are 45 watts. We at Metra always strive to listen to our customers. You have told us to do a better job at telling the Metra story. For over 70 years, Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to fit the needs of the installer. We are the "Installer's Choice" because we are installers. We design our products to be easy to use and easy on the eyes. If you can see a Metra product, then we haven't done our job. Metra 4" Dual Cone OEM Replacement Speaker, Black High performance OEM replacement Dual cone Speaker 4 In. Size= 4 in ; Way= Dual cone; Maximum Power= 45 watts; Impedance = 4 ohm; Sensitivity= 88-db/w/m; Frequency Range= 92-15,000Hz; Bass Dimension / Material= 4" Rubber edge injection; Magnet Material= Yferriet;Magnet Dimension / Weight= 4.5oz; Voice Coil Dimension / Material= 25mmASV; Frame Material= Steel;