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找到一些关于Sensitivity的文章，有兴趣的朋友可以看完链接里的文章。

samlovel(sam)
本文发表在 rolia.net 枫下论坛HEADPHONE SENSITIVITY MEASURMENTS

Just as with speakers headphones, which are mini speakers have a ‘sensitivity’. A low sensitivity headphone will need more power to drive it to a given level than a high sensitivity headphone. But it is not just about volume. A low sensitivity headphone needs an amp to drive it so as to bring out all of its sound qualities (sound stage, clarity, dynamics, detail etc) to their best level. Not amping a low sensitivity headphone is like putting a Mini engine in a Jaguar. It will still drive, but not the way it was intended. Even high sensitivity phones will benefit from being amped for the same reason, but less so.

If you look at the specifications for headphones you do not find a ‘sensitivity rating’. Instead you get a list which includes ohms and SPL (Sound Pressure Level). Ohms dictates the relationship between resistance, current and voltage. The higher the resistance the more current is needed to overcome that resistance. With headphone specifications the higher the number of ohms the more current the amp needs to provide. In effect it measures the ‘load’ presented to the amp.

However, the ‘sensitivity’ of the headphones is not just down to the ohms. SPL measures the amount of power is needed to drive the headphones to a given volume. According to Sennheiser a difference in SPL of 1db is just about perceptible. Doubling the SPL is equivalent to 6 db. A high SPL means that less power is needed to get to a given volume of sound. In effect it shows how much ‘power’ is needed by the headphones. (Some companies measure SPL in db/mW and others in db/v and I accept at the moment it is not clear who does what and the relation between them)更多精彩文章及讨论，请光临枫下论坛 rolia.net
(#7691650@0)
Last Updated: 2012-8-1
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Replies, comments and Discussions:

  • 枫下家园 / 减价特讯 / Groupon 现有高品质耳机，原价＄79， 现价＄6.99，包税包运费。短短几个小时已有950人买了。Sensitivity : 108 dB，懂行的朋友请说下是不是很好的耳机。谢谢。 -samlovel(sam); 2012-8-1 (#7691265@0)
    • 没品牌，没型号，居然 $79 value -13qiao(. ) ( .); 2012-8-1 (#7691323@0)
    • dollar店都开始卖这种耳机了。当然质量我不敢说。 -ysysning(樱桃果果); 2012-8-1 (#7691357@0)
      • 关键在于这个Sensitivity : 108 dB，我觉得iPhone耳机已经很不错了，但不知是多少dB? 可以对比一下。 -samlovel(sam); 2012-8-1 (#7691519@0)
        • 109dB -thisummer(特例独行的猪); 2012-8-1 (#7691553@0)
        • 你确定你知道耳机的sensitivity意义么？这只是耳机对电流的敏感度（电流效率），跟音质音效关系不大。 The sensitivity rating is usually -ysysning(樱桃果果); 2012-8-1 {177} (#7691558@0)
          for 1 milliwatt POWER input to the phones and a corresponding sound pressure level (SPL) output (USUALLY 102 to 106 dB SPL output for moderate to high sensitivity rated phones).
        • 如果你期望这个比IPHONE的耳机还好，你会很失望的~~~~如果你只要一个能发声的耳机，买也无妨 -natureguy(枫); 2012-8-1 (#7691630@0)
          • 找到一些关于Sensitivity的文章，有兴趣的朋友可以看完链接里的文章。 -samlovel(sam); 2012-8-1 {1714} (#7691650@0)
            本文发表在 rolia.net 枫下论坛HEADPHONE SENSITIVITY MEASURMENTS

            Just as with speakers headphones, which are mini speakers have a ‘sensitivity’. A low sensitivity headphone will need more power to drive it to a given level than a high sensitivity headphone. But it is not just about volume. A low sensitivity headphone needs an amp to drive it so as to bring out all of its sound qualities (sound stage, clarity, dynamics, detail etc) to their best level. Not amping a low sensitivity headphone is like putting a Mini engine in a Jaguar. It will still drive, but not the way it was intended. Even high sensitivity phones will benefit from being amped for the same reason, but less so.

            If you look at the specifications for headphones you do not find a ‘sensitivity rating’. Instead you get a list which includes ohms and SPL (Sound Pressure Level). Ohms dictates the relationship between resistance, current and voltage. The higher the resistance the more current is needed to overcome that resistance. With headphone specifications the higher the number of ohms the more current the amp needs to provide. In effect it measures the ‘load’ presented to the amp.

            However, the ‘sensitivity’ of the headphones is not just down to the ohms. SPL measures the amount of power is needed to drive the headphones to a given volume. According to Sennheiser a difference in SPL of 1db is just about perceptible. Doubling the SPL is equivalent to 6 db. A high SPL means that less power is needed to get to a given volume of sound. In effect it shows how much ‘power’ is needed by the headphones. (Some companies measure SPL in db/mW and others in db/v and I accept at the moment it is not clear who does what and the relation between them)更多精彩文章及讨论，请光临枫下论坛 rolia.net
            • 樱桃果果同学的说法是正确的，灵敏度跟音质是没有关系的，只能告诉你在同一功率下，相对而言声音的大小。 -natureguy(枫); 2012-8-1 (#7691723@0)
    • 也不贵，6.99，就买一个试试呗。就算不好也不会吃多大亏。 -lilianliang(彪妹); 2012-8-1 (#7691541@0)
    • 还不如sony耳机打5折的时候买一个，便宜的也就7、8块钱。还扛用。 -leonardmars(小马识途); 2012-8-1 (#7692231@0)

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