▪ 1985, The companies opal Sound Repro and Musikbetrieb merged into opal audio vertrieb GmbH.
▪ 1987, Opal audio vertrieb GmbH relocated to Ahrensburg, Germany and renamed German audio engineering, and established the "DAL" professional audio brand at
the same time.
▪ 1991, Serial production of DAL modular-I: Breakthrough concerning the acceptance of passive high-performance crossovers in the pro-audio-market.
▪ 1993, Relocation to Werther/Westfalia into more generous accommodations which became necessary due to an enlargement of the production- and administration-
capacities in the course of international cooperation and an increased product acceptance.
▪ 1995, DAL-ProStage-Monitors set new benchmarks on stage: efficiency, assertiveness and the exceptionally high audibility form the basis of a bestseller.
▪ 1996, Access to digital signal-processing thereby factoring FIR-filter-technology into the audio-signal-processing.
▪ 1998, DAL-Director-Series is launched, a new standard in performance and dispersion of professional speaker-systems is defined.
▪ 2000, Access to the development and production of new technologies in the range of optical wave-guide-multicore-systems.
▪ 2002, Development of the High Efficiency Crossover Design: all-pass-filtered and time-aligning passive crossovers in the DAL-System-Series for higher flexibility and
tonal adaptation, material to the superior installation sector.
▪ 2003, Concentration on the development of loudspeaker systems, spin-off of the wave-guide-multicore project, initiation of the conceptual design of a line-array-system.
▪ 2005, Development and evaluation of the prototype of the DAL-Director-Line-Array-System.
▪ 2006, DAL-Director-Waveline-System reaches maturity phase, BGV-C1-certification of the flight-mechanics.
▪ 2009, DAL-Director-Waveline-PT-System reaches maturity phase, BGV-C1-certification of the flight-mechanics.
▪ 2015, DAL has become a leader in professional audio in the European and American markets.
▪ 2020, In response to the global layout, DAL officially entered the Asian market.