[omholt]

Have you tried to place the speakers up against the right corner? (in Norwegian to explain where: altså diagonalt mot hjørne til høyre for der anlegget står nå. En på hver side av hjørne) That's something I would try. You'll get the coach a little further away from the wall and you will probably kill standing waves more effectively. It means that one speaker (the right one) will have the window as a first reflection point, but you can always place rockwool panels there when you listen to music.