4 bass traps (4" each) and one in each corner of the room. Two acoustic panels for the first reflection point. They are covered by Burlap bought at Walmart. The fiberglass is OF , 2" each piece.
Hvu - that's a very nice system; your choice of components is exactly what I would have picked. Unless I'm mistaken I believe the Plinius has a phono stage; are you planning to add a turntable down the road?