Stig Carlsson(1925 –1997), the famous Swedish sound engineer, created during a life time the principles of the ortho acoustic (OA) speakers. One of his first patent in Sweden was created 1953 and was about the first loudspeaker interacting with the walls and the ceiling in the listening room.
More should follow and at least 15 different models were produced during the -50, -60 and -70. In the beginning, much was about the reflections in the listening room. But in the -80 when the corporation with John Larsen in Skillingaryd (South Sweden) started the focus moved to the relation between direct sound and the reflections.
At that time Stig seemed to have found the right balance and the result of the corporation with John ended up in three new models OA51 (the first) and then came, not quite logical, OA50 and then OA52.
Stig was the constructor and the designer and John was the one who carried out Stig’s ideas. At the time Stig had no fax and absolute not a computer at that time so all communication was by phone and meetings. Most by telephone. Stig told John and he recorded it on his drawing board. John even build the prototypes, organized the production and guess how many he mounted himself. It was a lot and it went even more when he 1995 assumed the production in his own firm Larsen Hifi AB. Just two years after Stig passed away 1997.