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发表于 2011-6-30 17:36
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作者公司背景:
http://baike.baidu.com/view/1061894.htm?fr=ala0
[2009.12.29更新]
译者就文中的某些问题与作者进行交流,得到了一些答复,下面将E-mail原文和回复贴出来与大家共飨。
去信原文
> Roger,
> Hope that I've not disappeared from your memory(LOL)
> I'm very sorry to delay so long on this reply, after publishing the
> translation of your article. My girlfriend has just finished her
> chemical-treatment, and now I'm avalable again.
> I summerized some questions raised by the head-fiers' on bbs.erji.com.
> including mine.
> Firstly, the conclusion of your assay is that resistance is the judging
> element on speaker wires, but as we know, a speaker wire has 2 features -
> it serves both as a power line and a signal cable, and what determines
> here is the part of a power wire feature, is that right? And according to
> this, we found that the speaker wire is much similar to headphone wire
> which connects the sound source(e.g.phone out of CD player, amplifier or
> Mp3 player, etc) and the micro speaker units of the headphone or earphone,
> however, we could easily find some difference when wires are changed, for
> example, HD600 replaced with same resistance Cardas wire is easily found
> to be better-sounded. And Etymotic ER4P, connect with a 75 ohm resistance
> wire, which serves to make the total resistance into 100 ohm, when
> comparing with Etymotic's ER4S, whose resistance is 100 ohm, slight
> differences could be found. Differences could be found on ER4P with
> different resistance wires of the same resistance. This phenomenon
> confused some of the head-fiers.
> Secondly, in dynamic units, wires used to manufacture the coil units
> can be considered as a resistor, as resistance of the speaker unit (the
> coil) change as the frequency changes, are different speaker wires or
> headphone wires connected to the units changing simultainously? If so, do
> the dynamic unit and the speaker wires show same curves? And if not, is it
> a way that the speaker wires influent the sound?
> Thirdly, some head-fiers have some questions on signal wire and power
> wire, do they actually have any influence over the whole system? Will you
> please write an article about such cables?(Power cable of sound sources
> and amplifiers, signal cables linking sound sources and amplifiers)
> By the way, it's not avalable for me to visit your website currently,
> don't know why, but I'll try to find some proxy.
>
> Gary
去信译文
Roger,
希望我还没有消失在你的记忆中。(笑)
译文发布后许久才回信给你,实在抱歉。女友已经做完化疗,终于有时间了。
我总结了一下耳机上面一些朋友的问题,也包括我自己的。
首先,你文中的结论是:阻抗是喇叭线的决定因素,但我们所知,喇叭线具有两个特征——既有信号传输又有功率传输,而此时最大的决定因素在于其功率传输特征,是这样吗?根据文中所述,我们发现,喇叭线的作用与耳机线非常相似,,但是,更换线材后,我们可以很轻易的分辨出其中的差别,比如换了卡大师线的HD600声音具有提升,再比如阻抗100欧的ER4P+P2S与同样100欧的ER4S相比也具有轻微差别,ER4P和几个阻抗相同的P2S线或者插头连接,声音也不尽相同,这个现象令很多烧友迷惑不已。
其次,动圈单元中,绕制线圈的铜线可以看作电阻,当单元阻抗随频率变化,即绕制线圈的铜线阻抗随频率变化时,是否耳机线的阻抗也随之变化呢?如果是,那么是否单元线圈的变化曲线和耳机线的一样呢?如果不是,那么是否可以说这就是耳机线对耳机声音起到影响作用的方式呢?
再次,一些烧友对连接音源和放大器的音频线和连接电源和放大器/音源的电源线感到好奇,这些线材是否会对系统产生影响?您可否写一篇这份方面的文章呢(关于电源线和信号线的)?
顺便,最近打不开你的网页了,不知道咋回事,不过我会弄个代理试试的。
回信原文
Hi Gary:
Yes, resistance is the key factor in speaker wire. however, the assumption is that a good amplifier is used in the system and that poorly designed amplifiers could present problems. See my page at http://www.roger-russell.com/wire/wire.htm#capacitance
Any wire that transmits a signal involves the transmission of energy to activate the device at the other end and cause motion to the surrounding air. Increasing the resistance reduces the signal.
So power and signal are directly related and the signal involves power, large or small.
Our research was for loudspeakers and we did not get involved with headphones.
In many headphone connections from preamplifiers and power amplifiers, a series resistance of 100 to 220 ohms is used connected in series. This can often be equal or greater than the headphone impedance. This is very different to the very low source impedance of a power amplifier compared to the much higher speaker impedance.
Coil headphones may have a main resonant frequency which can be damped with various vents but they also can have an impedance (not resistance) rise due to inductance.
Roger
回信译文
没错,阻抗是音箱线的决定因素。但是,这是基于系统中所采用的是设计优良的放大器这一前提的,设计不当的放大器会导致问题,参见本文中音频线的容性一段。
信号线在传输信号的同时也传输功率,使其另一端带动空气振动。阻抗越高,信号越小。
所以说信号线和功率也是直接相关的,不管功率是大是小。
我们主要针对音箱进行研究,并不涉及耳机。
很多耳机的到前级和耳放的连线串接阻抗都可以达到100-220欧,一般都大于耳机本身阻抗。大大不同的是,和非常低的放大器源阻抗相比,音箱的阻抗要高上很多。
动圈耳机可能会有一个主共振频率,这种频率可以通过很多方式阻尼掉,但是这些方式本身也存在电感导致的阻尼(非阻抗)上扬。 |
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