Not sure it this is the right location for this thread? I was reading some information about placing a HT subwoofer on a stand that was filled with sand. I have my sub on a concrete floor covered by carpet, should I investigate the use of a sand filled stand. Will this increase the sound quality of my sub. It my understanding that this will allow the sub to move the air/pressure in the room not the floor or walls. Thanks in advance for all comments/help provided. Mark.