Hey guys, as the subject says, this may be a bit odd. My friend runs a Haunted House, and he asked me how to get a really deep sound projected into a room (about 10 foot square). He said he wanted the sound so low that it was more felt than heard. My suggestion was to get some sort of sound generator to send a signal into the best subwoofer he could find, but I'm not sure if that will be enough. Any suggestions?