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A styrophone is an acoustic device made from expanded polystyrene foam (often referred to by the genericized trademark ''styrofoam''). There are at least two varieties: * an acoustic musical instrument * a type of loudspeaker * a cellular device used by Wale (rapper) 〔"Wale's Timeline" by Wale ()〕 The musical instrument consists of a foam box that is forced to vibrate by a variety of means, such as friction against a wooden stick. Technically, that instrument is a type of friction idiophone. Styrophones tend to last for only one performance, as the friction destroys the material. 〔"Frictioned Foam" by Liam Mooney ()〕 The loudspeaker is a cheap home-made variety that consists of a crystal earpiece attached to a cone made from a foam cup or sections of packing material.〔"Styrophone Crystal Loud Speaker" from Peebles Originals ()〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Styrophone」の詳細全文を読む スポンサード リンク
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