In 1966, the head of Swedish radio Olof Rydbeck and director of music
Karl-Birger Blomdahl approached the then Minister of Transport and Communications
Olof Palme about the need for a new home for the national radio orchestra where they could rehearse, record and give concerts in the same hall. Plans began in the 1970s. The hall was originally supposed be located at the end of the Karlavägen esplanade but was moved further along the water. The site was selected to allow the hall to merge with nature and was positioned in the rock so it would not look too large. The interior hexagonal shape was partly for acoustic reasons, but the hall had to be acoustically adjusted several times subsequently. Gaps between the wood panels were adjusted to control the reverberation time. == Concert activity ==