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发表于 2006-9-18 18:22:55
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关于这些HEADROOM公司的频响曲线,HEADROOM是用假人头系统做的测试. 它还做了一个说明,原文如下:
A natural sounding headphone should have a gentle hump in the bass (about 3 or 4 dB) between 40Hz and 500Hz. (This compensates for the fact that headphones don’t give you the physical punch that the sound from a speaker has; so a slight compensation of increased bass is needed for natural sound.) Headphones also need to be rolled off in the highs to compensate for the drivers being so close to the ear; a gently sloping flat line from 1kHz to about 8-10dB down at 20kHz is about right.
You’ll notice all headphones have a lot of ups and downs in the high frequencies; this is normal and mostly due to reflection cancellations in the folds and ridges in the outer part of the ear. Ideally however, the ups and downs of the frequency response should average out to a flat line. Large peaks or valleys over 3kHz in width usually indicate poor headphone response, and should be viewed as a coloring of the sound. Some small dips in the highs may actually be desirable and should exist in the 2kHz to 8kHz region.
这大致是说,耳机频响曲线在低频40-500赫兹间有个小的隆起是正常的,因为耳机不能象喇叭那样给人真实的低频冲击力,所以在这个低频段加强一些,声音反而自然逼真些. 另外,为避免太刺激耳朵,耳机在1000赫兹起到耳朵听力的极限20000赫兹间应该有衰减,到2万赫兹处比平均输出低8-10分贝是正常现象.
另外耳机的频响曲线在高频有很多峰和谷,也正常,因为人的外耳廓里有很多的凹凸不平的地方,造成声音反射互相干扰. 但3000赫兹以上的大的峰和谷是不好的,往往代表耳机素质有染色(小白按,当然染色也未必总是坏事). 高频大约在2000到8000赫兹间的小谷,有些反而是好的. |
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