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S0 : with [esuzero].

  Vibration system [sutei;funesu] with S0 accurately. Powerful of spring of edge and damperIt is understood that there are the one that repulsion is strong and the power of the spring is strong, and a weakness and the one of whiffling in the opposite repulsion when the speaker unit is pushed by the finger. The unit and the latter that S0 is low call the former a unit that S0 is high.

  If S0 is one of the factors that decide lowest resonance frequency f0 of the speaker unit, and other factors are the same, f0 can be lowered in the one that S0 is low. (It becomes easy for the bass to go out. )

If F0 and M0 are understood, it is possible to request it though it is not written basically in the catalog by the following expressions.