But this current isn't powerful enough to move the cones within loudspeakers these cones are vital for translating electrical signals into audio. On its own, a weak audio signal (from a mixing board, preamp, etc.) produces a modest electrical current. While De Forest's first Audion amplifier was too weak to manage telephone line voltages, modern power amplifiers boast immense power and capability.Īt the most basic level, power amplifiers convert a weak input signal into a more powerful signal - with minimal distortion. (Even more ironic is the fact that de Forest was expelled from his postgraduate studies at Yale when his electrical experiments caused building lights to blow in the middle of a lecture given by the imminent professor, Charles Hastings). And while de Forest spurned his father's hopes that he would become a pastor, there's irony in the fact that many of today's pastors rely on de Forest's invention every Sunday. The American inventor, Lee de Forest, is credited with inventing the first power amplifier in 1909. Power Amplifiers: The Source of Live Sound Marching Percussion Accessories Shop By Category Guitar Workshop Keyboards & Synthesizers Shop By CategoryĬase Finder Drums & Percussion Shop By CategoryĬable Finder Microphones Shop By CategoryĬase Finder DJ Equipment Shop By CategoryĬable Finder Band & Orchestra Shop By Category

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