Despite the fact that Panasonic claims only 92dB/1 mW sensitivity for the HD10, equivalent to 109.4dB for 1V, and makes no extravagant claims for its motor system, this is one of the most sensitive headphones I've measured in a long while: an average for the two capsules of 121.7dB SPL for 1 Vrms. The HD 10's low impedance is in significant part responsible; at 18ohm nominal it is at least a factor of two lower than most competitors, and that's worth 6dB. Lower-impedance 'phones often display quite wide impedance variation with frequency which makes them susceptible to response modification when used with signal sources having high output impedance. But here's another respect in which the HD10 is remarkable for a moving coil design: its impedance variation is just 1 ohm (from a low of 18ohm to a high of 19ohm, from 20Hz-20kHz), meaning that you can use it with most headphone outlets without fear of significant changes in tonal balance.
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机译：尽管Panasonic声称HD10仅具有92dB / 1 mW的灵敏度，相当于1V时为109.4dB，并且对其电机系统没有过多要求，但这是我长期以来一直测量的最敏感的耳机之一：两个胶囊的平均值为1Vrms，为121.7dB SPL。 HD 10的低阻抗在很大程度上负责。在标称值为18ohm的情况下，它至少比大多数竞争产品低两倍，并且值得6dB。较低阻抗的电话通常会随频率显示出很大的阻抗变化，这使得它们在与具有高输出阻抗的信号源一起使用时容易受到响应变化的影响。但是这是HD10在动圈设计方面的卓越表现的另一个方面：其阻抗变化仅为1 ohm（从20Hz-20kHz的18ohm到19ohm的高阻抗），这意味着您可以在大多数耳机中使用它网点，不必担心音调平衡发生重大变化。
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