I'm thinking that Busto, in Italy, has most of this stuff, and then some. Those gotta be the biggest, baddest subwoofers I've ever felt.....
http://images.google.com/imgres?imgurl=http://www.royaldevice.com/sala%2520audio/td160%2520decoupling.jpg&imgrefurl=http://www.royaldevice.com/custom.htm&usg=__bMRN4T4F2yozpmovGRHVkCeRvlg=&h=600&w=800&sz=101&hl=en&start=7&um=1&tbnid=5_mZWKqglXNAcM:&tbnh=107&tbnw=143&prev=/images%3Fq%3Dthorens%2Btd-160%26hl%3Den%26sa%3DN%26um%3D1
http://images.google.com/imgres?imgurl=http://www.royaldevice.com/sala%2520audio/td160%2520decoupling.jpg&imgrefurl=http://www.royaldevice.com/custom.htm&usg=__bMRN4T4F2yozpmovGRHVkCeRvlg=&h=600&w=800&sz=101&hl=en&start=7&um=1&tbnid=5_mZWKqglXNAcM:&tbnh=107&tbnw=143&prev=/images%3Fq%3Dthorens%2Btd-160%26hl%3Den%26sa%3DN%26um%3D1