Christos Tsigiridis (, pronounced ; 1877 - 1947) was a Greek electrical engineer and technological pioneer of his era. He was the first who imported the technology of sound reinforcement systems to Greece and led the installation of the first sound system in the Greek Parliament. He is mainly known for setting up the first radio station in Greece and the wider Balkans in the city of Thessaloniki. Birth and first years Christos Tsigiridis was born in 1877 in Filibe in the Ottoman Empire (today Plovdiv, Bulgaria) by Greek parents. The once wealthy and aristocratic family of Georgios Tsigiridis had a hard time, which worsened after his death. At the start of the 20th century they were forced to leave and move to Stuttgart in Germany. There, they founded a small cigarette production unit which brought enough money to allow Christos to study. Finally, he was able to study in the electrical mechanisms faculty of Stuttgart. A few years later, he was married to Maria Louise Vogel and they moved to Greece together in 1918. They would remain together until her death in 1933. After moving to Greece, he settled in Larissa, in the house of his brother, Nikos. There, he was appointed director of the city's Electric Lighting and Water Supply Company. However, he was more interested in pursuing the experiments with wireless communication he had first seen in the university. Therefore, he decided to move to Thessaloniki, aiming to fulfill his vision: to found a radio station. The loud speaker, or "big speechmaker" The first tests on radio transmission were carried out in his home, in Thessaloniki. In 1926 the 1st Thessaloniki International Fair was held in the area in front of the 3rd Army Corps premises. Tsigiridis' home was almost across the street, in the former Dimokratias street (nowadays called Vassilissis Olgas). During the Fair, Tsigiridis sold loudspeakers and sound amplifiers as an agent of the German Siemens & Halske company. It should be mentioned that the devices were completely unknown in Greece, at that time: his sound reinforcement systems and his loudspeakers in specific were described as "noisy instruments" and caused awe and marvel to people. Most impressive of all was a radio receiver which he installed in the central square of the Exhibition. His loudspeakers played spots about the exhibitors and music. The term "loudspeaker" was non-existent at that time in the Greek language. Thus,