On Christmas Eve of 1915, a prototype sound reinforcement system from Magnavox allowed crowds at the San Franscisco City Hall to hear a caroling concert. On December 10, 1915, Jensen and Pridham presented their groundbreaking invention – the first electrodynamic loudspeaker – to the public for the first thime in Golden Gate Park, San Francisco. The next day The San Francisco Bulletin published an enthusiastic article about the event: “Great invention made of Californians solves many problems. The slender tone of a single violin heard about a mile away. The sound operatic Luisa Tetrazzini's vo

Willy Aubert