耳机的频响曲线和音箱没法比，“以耳机为师”的要注意了

yxiao

进来膜拜大智慧。[s:14][s:14]

光芒四射

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青岛子弹 发表于 2013-11-19 14:45
还有呢。这个起伏度更大！这是什么意思啊？

阻抗和相位，这个你都不知道[s:14]

光芒四射

yxiao 发表于 2013-11-19 14:45
进来膜拜大智慧。

希望技术方面你也能参与，有了知识就不用卑躬屈膝了[s:14]

yxiao

光芒四射 发表于 2013-11-19 14:49
希望技术方面你也能参与，有了知识就不用卑躬屈膝了

不敢，大智慧神面前，我连学习的资格都没有。呵呵。

青岛子弹

Normally, speakers are measured in an anechoic chamber with the microphone calibrated exactly a meter away from the tweeter.
But in the case of headphones and earphones, it is often impractical to have the measuring equipment in this configuration. This is because headphones and earphones seal the air around the ears when worn, which changes their sound significantly.

Because of this, headphones and earphones are measured using a dummy, such as the Ear Simulator or the Head and Torso Simulator, which emulate the environment in which they are used. The microphones here are located so as to mimic the human body as much as possible, situated where eardrums would be in a person.
However, once the microphones are out of the anechoic chamber and inside the simulated ear canal, there is another variable: the microphone registers different frequencies based on where it is within the ear. This is due to the resonance caused by the structure of the canal, and tends to occur around the 3 KHz mark.

The distortion, of course, requires compensation, and a correct calibration is essential for an accurate measurement. The graph below is the calibration used with the Bruel & Kjaer Head and Torso Simulator Type 4128C, the model currently used at Golden Ears. The calibration is obtained from the characteristic response in a Diffuse Sound Field, as headphones and earphones have a sound similar to that in this environment.
The strict usage of the word ‘flat’, as applied to speakers, implies that the frequency response curve is flat in a testing environment - namely, the anechoic chamber. Then the question is: would ‘flat’ speakers still sound flat when used in a listening room, a theatre, or a recording studio?

There are several data that answer this question - the first graph, courtesy of Etymotic Research, shows the characteristic response of a recording studio with high-end equipment.
Notice that the ‘flat’ speakers actually represent progressively weaker responses in the studio as the frequency increases - this is similar to the X-Curve, the standard to which theatrical setups are tuned, and also to the Golden Ears office.
As master recordings are created in a studio with this characteristic, further calibration must be done in order to make the response more accurately resemble what we perceive.



节选自，你转发过来的网站：http://en.goldenears.net/388

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yxiao 发表于 2013-11-19 14:51
不敢，大智慧神面前，我连学习的资格都没有。呵呵。

不会，这些道理并不深，只有不学习的心态，没有不能学习的资格。

青岛子弹

光芒四射 发表于 2013-11-19 14:47
阻抗和相位，这个你都不知道

哦 原来如此 。哪一条是阻抗？哪一条是相位？

光芒四射

青岛子弹 发表于 2013-11-19 14:59
哦 原来如此 。哪一条是阻抗？哪一条是相位？

这个耳机阻抗有个大的谐振峰，你看那条线有谐振峰呢？

光芒四射

光芒四射 发表于 2013-11-19 15:02
这个耳机阻抗有个大的谐振峰，你看那条线有谐振峰呢？

答不出来吗？
是下面那条是阻抗曲线，严格的说是电抗曲线。

青岛子弹

           M-Audio Studiophile AV 40     



森海HD700

青岛子弹

[s:97][s:97][s:97][s:97]

太好玩了！{:soso_e120:}

光芒四射

AKG K701的曲线PDF格式，12K左右比1K衰减了25分贝，这并不是便宜耳机。
AKG K701的曲线

炸弹卡车

光芒四射 发表于 2013-11-19 15:58
AKG K701的曲线PDF格式，12K左右比1K衰减了25分贝，这并不是便宜耳机。
AKG K701的曲线

老兄耳机测试不是自由场测试，经过对录音话筒，房间声场，以及人工耳的补偿声压曲线才成了这个样子



自由场环境对振膜的模拟是很正常的，可以说耳机考虑了更多的控制因素，对还原录音素材有更好的说服力

光芒四射

炸弹卡车 发表于 2013-11-19 16:15
老兄耳机测试不是自由场测试，经过对录音话筒，房间声场，以及人工耳的补偿声压曲线才成了这个样子

耳机测试用“人工耳”的。

炸弹卡车

光芒四射 发表于 2013-11-19 16:33
耳机测试用“人工耳”的。

[s:97]