麦景图工程师对线材性能的分析
本帖最后由 agnostic 于 2013-6-5 18:35 编辑http://www.roger-russell.com/wire/wire.htm
作者Roger Rusell是Formerly Director of Acoustic Research at McIntosh Laboratory, Inc.
原文较长，节选部分原文
Several speaker wire manufacturers make wire that has high capacitance yet almost none of them publish exactly what the capacitance actually is. Capacitance is of concern not so much that it could cause a possible high frequency rolloff but that it can affect the amplifier feedback and cause the leading edge of transients to overshoot. This in turn can make an audible difference in the system sound. It can make the sound brighter, which some audiophiles mistake as greater detail.
The degree of influence when using high capacitance wire depends on three factors.1. The total capacitance of the wire used (capacitance per foot times the number of feet).2. The complex impedance of the speaker being used.3. The stability of the amplifier being used to drive the speaker.
When there is an audible difference in speaker wire due to wire capacitance, it can be interpreted as an improvement when one wire appears to have more clarity but is actually altering the sound and departing from accuracy. Perhaps this change in sound then paves the way to sell more wire. Further, perhaps the wire companies already know this and what will sell.
喇叭线对声音的影响取决于线材的电容，喇叭的综合内阻和功放的稳定性。有些喇叭线故意设计成具有高内阻值，有可能会听上去更明亮一些，但是那是失真的表现，却可能被认为是听到了更多的细节。而且一台设计良好性能稳定的功放，是很少会受到线材电容带来的影响。只有那些稳定性较差的功放才可能会带来显著的影响。
Many owners of high-end audio and video equipment value “oxygen free” copper. Behind this demand is the belief that it will have enhanced conductivity or other electrical properties that are significantly advantageous to audio signal transmission. However, as indicated above, most C11000 common copper sold today meets or exceeds the 101% IACS conductivity and overlaps C10200 “oxygen free” that has a minimum of 100% IACS conductivity. In practice, there is no significant difference in conductivity between all three of the grades as far as audio use is concerned.
It can be solid, stranded, copper, oxygen free copper, silver, etc.--or even "magic" wire--as long as the resistance is kept to be less than 5% of the speaker impedance. There is no listening difference as long as the wire is of adequate size. Bear in mind, as previously mentioned, a well-designed amplifier will not have a problem with any of these wires.
符合国际标准纯度的铜对于音质的影响是很小的，甚至最普通的C 10200（仅3N纯度）的铜就足够满足音响设备的需求。对于设计良好的功放而言，只要线材的阻抗不超过喇叭内阻的5%，是不会带来明显的听觉差异。
银线的导电性虽好于铜线，但是并无法带来声音的提升。
Looking at this from a different perspective, there will always be those who will want expensive wire, not because there is an audible difference, but because they may value pride of ownership and prestige in a similar way to that of owning a Tiffany lamp or a Rolex watch.
其他部分对线材的垫材，煲线器他都认为属于是this is just another way of making money. It can be considered as another “quack” remedy machine.
其中还有一个链接分析了功放阻尼系数的问题，那是Damping, Damping Factor, and Damn Nonsense
所以说线材大部分都是忽悠钱的！ 麦景图的器材声音不好原因是:接什么线材都是不好，就造成线材作用不大。{:soso_e151:} 楼上的精屁。 xing123 发表于 2013-6-5 15:48 static/image/common/back.gif
麦景图的器材声音不好原因是:接什么线材都是不好，就造成线材作用不大。
按照老头的逻辑也可以说，线材有明显区别，原因是你的功放unstable and borderline 只要线材的阻抗不超过喇叭内阻的5%，是不会带来明显的听觉差异。
发烧线可是很多不符合这个保准的，所以带来了明确的听觉差异，于是乎有人认为很好听。。。
曰（念 yue 二声，不念 ri 四声），调（念tiao， 不念 diao）音。 江苏狗狗 发表于 2013-6-5 15:52 static/image/common/back.gif
人家德国Audionet，机内线都是问银采定制的金银合金，好声也是必然的了。
这个是典型的marketing, branding，否则双汇也不会去买美国猪肉厂了。 本帖最后由 agnostic 于 2013-6-5 16:28 编辑
kyokyo 发表于 2013-6-5 16:11 static/image/common/back.gif
只要线材的阻抗不超过喇叭内阻的5%，是不会带来明显的听觉差异。
发烧线可是很多不符合这个保准的，所以 ...
老头是说有些线材电容高导致声音变化。
电阻按照他的意思，只要够粗，纯度达标，都不会有差别。原文里有喇叭阻抗曲线，标称4欧姆的喇叭在20HZ时候阻抗最低为4.7欧姆，其5%是0.235欧姆。以雅高S7000为例，阻抗是6.4毫欧姆/米，所以这跟线要超过36米的情况下会导致声音恶化。假设某喇叭最低阻抗为1欧姆的时候，S7000线长不超过7.8米也是不会造成声音恶化的。
本帖最后由 agnostic 于 2013-6-5 16:34 编辑
江苏狗狗 发表于 2013-6-5 16:25 static/image/common/back.gif
只要你愿意，可以找出一切借口反线材，不是么，所以，随你去了，我在本帖的回复，到此结束
反对还是支持，这个是基于主观，与事实无关。Audionet还是银彩并不是线材好坏的必然保证，如同双汇买了美国猪肉厂，不等于就不用瘦肉精了。老头是分析了一些线材可能的影响因素，对比动态更好、背景更黑、低频更扎实这些主观判断，谁更靠谱呢？ 所以麦景图不做线，也做不出好线。 这个麦景图工程师 YY的厉害了 不是删了吗？{:soso_e114:}
