We made a box (obviously), with 2 rooms in it, about 20³" a room.
In one of the rooms we placed a 90 watt speaker, wich can be replaced if you want to.
In the other room we can place a mic.
some of you might now know whats the meaning of this thing.
We made it with sound dense walls.
So we can:
-Record better
-record very,very,very loud without getting our neighbours angry.