My living room has a ceramic tile floor. I am going to get a rug to absorb some of the high frequncy sound. If I have floor standing speakers, where should the rug go? I am going to put it under the furniture, but how close to the speakers should it go? Should I run it right up to the speakers, or stop it a few feet short of the speakers? I will set the speakers directly on the ceramic tile floor, 20" from the front wall.