subwoofer test http://www.youtube.com/results?search_query=subwoofer+test
sound test http://www.youtube.com/results?search_query=sound+test&search_type=&aq=f
Infrasound http://www.youtube.com/results?search_query=Infrasound&search_type=&aq=f
まとめ→http://innutunokuni.blogspot.com/2009/07/blog-post_5654.html
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