淺談黑膠系統 - 唱臂篇第一集 Vinyl Playback
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固定支點唱臂的有效長度與超距 --

軸距是唱臂支點與唱盤軸心的距離，超距是唱針尖超越唱盤轉軸的距離，而唱臂的有效長度就是軸距與超距的總和。
固定支點唱臂的有效長度與超距 --

軸距是唱臂支點與唱盤軸心的距離，超距是唱針尖超越唱盤轉軸的距離，而唱臂的有效長度就是軸距與超距的總和。
Overhang and effective length of a pivoted arm --

The arm effective length is the distance between the arm pivot (fulcrum) and the turntable spindle plus overhang. Overhang is the distance of the stylus tip protruded from the spindle.
L = Distance between the arm pivot and turntable spindle