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What is the ion type speaker?

What is the ion type speaker?

  The ion that generates it by the high tension power is vibrated by the alternating voltage and the speaker of the method to emit the sound. There is no vibration board and the maximum feature is given the transition characteristic excellent theoretically.   

  It seeming was the beginning and be the last product though the representative of the ion type speaker was developed for about 30 years in France ago, and got the commodity "[Ionofon]" commercialized. A low region was naturally ..ion type speaker.. impossible, and it was used as a driver of the horn [tou;i-ta-].

  At that time, this [ionofon] expanded up to many hundreds of K hz, and did not become a main current because it did, it was not appropriate for the bur and [ooidechikara], and it sensitive to the system requirements when it was the epoch-making one.