Simple questions: Why do you think you need external amplification? Is your listening room large? At what distance is you listening position from the front speakers? What kind of music do you listen to? How loud do you listen to your music? What speakers are you using for your left and right front channels? Do you hear some sort of distortion?
Usually, it takes only a few watts to drive speakers in a typical home unless the speakers have a low sensitivity, and you listen to music at very high volumes.