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单元 1

回放 at such 低 级 requires 增强 低 and 高 to restore a semblance of 品质

This is the 原则 of the so-called 响度 均 which is practiced by 高保真 enthusiasts

The 均 required to make 低级 樂/乐 声波 right comes close to tracing an 等响 contour

By a 类似 过程 other 曲线 are traced each tied down to a 特定 声压 级 at 1000 赫兹（he zi） These 级 at 1000 赫兹（he zi） are arbitrarily called 响度 级 in phons

When you go to an otologist or a clinical 听力学家 to have your 听觉 tested your 听力图 is really your own personal 最小 可听 等响 contour!