The idea that synthetic carpeting can act as a dielectric is valid. However, the thought that an Audiophile would have bottom of the barrel plastic builder grade wall to wall carpeting in his listening room makes no sense at all. It's just a few $hundred bucks to hardwood floor a room. Throw a nice wool rug down, and you've got a cozy comfortable living space. With out the filthy allergen filled wall to wall garbage carpet.
