The black curve shows the response with the tweeter connected with opposite polarity.

图里的黑色曲线显示了极性反向相连的高音喇叭响应。

If the background current is the opposite polarity, these unwanted currents could current reading.

这就是说,电流的极性和所加电压的极性相反, 于是计算出的电阻将为负值.