Soundless Sound System

http://story.news.yahoo.com/news?tmpl=story&cid=562&e=2&u=/ap/hypersonic_sound

This sounds really cool and expensive. I bet that it would be awsome to use to watch movies and play ps2 with.

yeah, its actually not that expensive to make, it uses super high frequencies to rattle your skull or whatever ;) (higher freq noises have a much narrower focus, 20hz projects 270 degrees, every octave up is 35 degrees less... 40hz is 235, 80hz is 200 etc etc)

its like an audio laser :)