The acoustic properties of wool are superior to any other fabric or synthetic material. However, any type of carpeting will be better than bare wood floors. Without carpeting of some kind you will have substantial reflections off the floor. I had wall-to-wall carpet installed (covering hard wood floors) and then bought Persian carpets (wool) to cover the area of the living room floor between the couch (listening position) and the speakers. The results are well worth the effort and expense.
