How Can I Make A Room Completely SOUND-PROOF?
The military has actually made near soundproof rooms by doing all of the standard things you would do to make a soundproof room and then hoisting THAT room up with steel cables and suspending it in mid-air in the middle of ANOTHER enclosed soundproof room. A lot of money and a lot of space, but it helps! No such thing as a completely soundproof room, by the way, unless it is completely surrounded by a vacuum. Also, insulation and sponges and stuff don’t work as well as closed cell foam that can be found at guitar center. It has angled reflective surfaces and captures the sound quite well.
