Hi all. I am moving into a condo and have a set of logitech z5500's. In my house now even with them on very low I can hear them directly underneath (the subwoofer) and it penetrates the downstairs ceiling. Im worried because if I ever want them on normal volume Im afraid my neighbors downstairs will hear them. Im only concerned about the subwoofer. I was wondering if there is some sort of "mat" or something that I can put underneath the sub to prevent it from penetrating so easily if thats the case in my condo. I want something that will obviously preserve the sound quality of the sub just don't want alot of the sound waves from the sub going to the bottom house. Any suggestions?