My room is smaller than yours 4.25 meters x 5.5 meters and I sit about 2.5 meters from the speakers. I have the Genelec 8351b and 2 7350a subwoofers and I rarely turn the volume above .25 to .45 depending on the source. If I went for the Genelec you could try the 8361a or even the S360. Depends on how far you sit but the 8351b with subwoofers might be enough Genelec has a chart showing optimal listen distance and room size.
https://www.genelec.com/correct-monitors
https://www.genelec.com/correct-monitors