What do you think about the back wall? I have two columns about 5 feet apart with dipole speakers inside the columns. I was going to put 4 inch thick OC 703 between the columns and put the FRK facing on so I don't absorb too much of the sound from the dipole speakers. I still want the sound to reflect a little.
Ready to buy Roxul and Pink Fluffy. I got a few important questions before committing a lot of money to it.
1. Should I get 40, 60 or 60 KG/M3?
2. Pink Fluffy (glass wool). This if for under the Riser (as a general bass trap). I intend to fill it all up, about 6 feet in length and 10 feet wide, and 1 feet high. Again, people say get pink fluffy/glass wool instead of RockWool, so, again, the question, would 30 KG/M3 work?