I just picked up rockwool and some wood for building big 124cm x 124cm x 14.5cm broadband absorbers for my early reflection points. I will use the same Paroc FPS14 wool (66 kg/m^3) that I used earlier for my other absorbers (4x 120cm high corner traps + 3x 124x64x15 flat ones). I will put 2x 5cm layers of the wool in the frame and leave 4.5cm free space behind the wool. I will use felt in front and behind of the frame in addition to a white finishing fabric to avoid the dust. These will definitely suck some bass too. I will post some pics when I get them ready. I will probably start building them tomorrow.
