25 to 75 watts, depending on what you need them to keep up with. For example I put a pair of these in a single cab truck that does a 138 and change sealed on the dash with a termlab. We put a pair of these on a 50 x 2 amp with it turned all the way down, remembering these are 8 ohm, and they walked all over the bass and sounded amazing, the staging is amazing with these. The terrible acoustics of vehicle are of no concern with these. They make the music litterally seem like someone is standing front and center of you. These are very efficient and some of the most amazing sq cars run ID horns. Horns owned the sq market for years. Nothing compares to horns.