When I think of Natural sound, I think of a sound that does not sound like a PA system or instruments just sounding like noises and not instruments. I also think of a sound that is not so etched. for example, many times I sit within the first four rows at Severance Hall. The instruments never sound like I can pick out each violin or Viola player and so on. The clarinet sounds just like it should just where it should be, not overly forward or as in many systems the horns sound like they are right in front of you. They should not. They should sound like where they are located and in proper proportion to the rest of the orchestra and the correct size of sound. Sometimes I hear peoples voices that sound 7 feet wide on some systems. They should not. they should sound like a real persons voice and the correct size, not ampified like through a PA system.