ATL Lautsprecher GmbH was founded in December 1982 by Bernhard Mörtl in Germany, initially acquiring inventory from Atlantic Lautsprecher GmbH where Mörtl previously served as Sales Manager. The company collaborated with acoustic researcher Hans Deutsch, becoming known for innovative 'Hornresonator' technology - a specialized bass reflex system where air mass at narrow outlets acted as membranes amplified by short horns. ATL also developed 'acoustically active crossovers' using mechanical filters and housing specifications for effective frequency separation. In 1989, the company rebranded as ATL Elektro-Akustik Vertriebs GmbH with Klaus Dotter as Chief Developer, transitioning from Hornresonator to conventional bass reflex principles with Scandinavian woofers. ATL became Germany's fourth-largest speaker manufacturer, producing multiple series including the premium 'Pro-Line,' design-oriented 'Avantgarde,' and ultra-slim 'Slim-Line' models. Despite significant market success and technical innovation, ATL ceased operations in 1994, ending a notable chapter in German loudspeaker manufacturing history.