The wall behind the monitors is covered with heavy drapery, behind which is a 60 cm deep space filled with: 10 sleeping bags in big cotton sacks, about 6 backpacks, 6 tents, outdoor clothing on hangars, climbing & camping gear etc in steel mesh baskets, one large ski pulk. Oh, Genelec 7071A subwoofer...
Seems to work extremely well. I have tried to concentrate the soft things (down bags and clothing) in the corners a bit.
