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To match a 300-watt speaker, you would typically need an amplifier that is capable of providing 300 watts of power or more. However, it is important to consider the amp’s RMS (continuous) power rating rather than its peak power rating. The RMS rating gives a more accurate measure of the amp’s consistent power output. Also, note that matching the power wattage alone doesn’t ensure good audio quality; the amp should also be compatible with the speaker’s impedance and have a clean, undistorted power output. Consult the manufacturer’s recommendations for the specific models you are considering.