Here is a link to a 12" Model on ebay. They kinda remind me of the Mach SPL12
http://cgi.ebay.com/08-WMD-12-inch-subwoofer-55-lbs-1500-wrms-5000-peak_W0QQitemZ120269475955QQihZ002QQcategoryZ18803QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/08-WMD-12-inch-subwoofer-55-lbs-1500-wrms-5000-peak_W0QQitemZ120269475955QQihZ002QQcategoryZ18803QQssPageNameZWDVWQQrdZ1QQcmdZViewItem