Hi!
There seems to be alot of talk about bass trapping on the board right now so I thought it was a good idea to post some info on how I built mine. I really want to encourage everyone to build their own, it's easy and well worth the effort!
Each trap is built as a 17 cm deep frame housing 15 cm (6") of rock wool (not the brand) then the front and back is covered with fabric.
Here is the material for the frame. You can also see four angled metal plates. They are there to prevent the rock wool from slipping out the back.
/Cojo