„In the old days, especially at the circus and theater we were accustomed to hear the voice amplified at times by means of a large megaphone, thru which a person endeavored to shout. But the voice was invariably muffled and did not sound as clear as the original by the time it reached you. Now, thanks to the audion amplifier, the human voice can be amplified until it is so loud that it will almost scare you to death, and always it is articulate and distinct.“ [Secor in: Electrical Experimenter 1920]