Joeb....I originally chose to use RC because I was sharing my house with a couple of other people and wanted to soundproof my room as much as possible. Music will get into the studs and travel all over the house without the RC, which very effectively isolates the studs from the drywall. The use of fiberglass is also very important. It works really well, and I do listen to loud music sometimes when playing my electric bass, but rarely over 100 dB. If you do not really need soundproofing you could just use the fiberglass and two layers of drywall. The most important reason for doing all this for me was sonics, and really solid walls with insulation make a huge difference. Also, it is ideal if your room as at least an 8 foot ceiling and is in the shape of a shoebox. My room is 13 feet wide by 22 feet long. I can send a picture if you email me.
