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What is [fikkusudoejji]?

    [Fikkusudoejji] is the one that the extension of the material of the vibration board was assumed to be an edge (In a word, the material of the vibration board and the material of the edge are the same). In the edge used for speaker [tsukuuki], most was the one of this type. A free edge doesn't see a type here so much in the main current now.

  The kind is the one that the corrugation was increased, covered what of the expandable polyurethane from on, and has various one like the one that the dumping material was spread and the one that the angle was applied to the corrugation, etc.