Jan 31st, 2011, 18:46 | 只看该作者 #41 |
Senior Member
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Too much time has been wasted on this topic.. There were many many tests have been done around the world, all you need to do is to google it, like this famous one done by the president of McIntosh Laboratory http://www.roger-russell.com/wire/wire.htm In the early 1980's, special speaker wires were beginning to appear on the market. Some of the claims were totally unbelievable and had prices to match. Realizing that wire resistance was the critical factor in speaker wire, Gordon Gow, President of McIntosh Laboratory, used a speaker cable demonstration to show there was no listening difference between these wires and plain line cord. He delivered his presentation about the truth in speaker wire using a reel of Monster cable to stand on. Fifty-foot lengths of wire were used in the comparison. The setup consisted of a master control relay box and two slave relay boxes. A three-position switch was used to select one of three different speaker wires of equal length. One was line cord. The other two wires were from popular manufacturers. 8-ohm speakers were selected to be used in the test. The two other brand name wires were heavier than the line cord. Another one done in 2008 in China: 线材盲听(结果在第八页111楼) http://www.jd-bbs.com/thread-1572113-1-1.html 第八页111楼: 所用线材 先两台CD机俱用完全一模一样的2组机线信号线和电源线机线进行机器和碟片的试听熟悉。结果是两台CD机和碟片没有区别。 电源线机线和XLO旗舰、老三间比较;MIT V2.1、AQ旗舰亚马逊和机线信号线比较;MIT V2.1和AQ亚马逊比较(信号线都是RCA)。 结论让我及在座所有烧友异常失望!盲听没有任何区别!根本无需记录,一致的认为不可分辨!起码在我这里这套系统上不可分辨!!! 在座的没有一位的系统总值低于10万,每位手头或曾经都玩过二手过万的昂贵线材,只有一位的烧龄低于2年,但他目前的系统总值近30万。其它人的烧龄最少的也有5年,最长的近20年,这位的系统也是最贵的,就是我家访帖中天朗GRF HE的那位! 今天的结论:最起码可以这么说,总值10万以下的系统完全可以不用考虑电源线和信号线。GRF的老友认为是系统档次不够,其实我很想和另一位朋友(EMC1UP的用家)一起,把我们的两台CD机都抱去老友家(老友是老版不带UP的EMC1),再进行一轮盲听。尽管我觉得结果不会有啥变化! I think that this is not an issue about cables, this is an issue about religious belief, no matter how many tests you do, people who believe in cables will still believe in cables.. and they will deny your test as a valid one, or say there is a higher truth which cannot be proved wrong by any test done by human!! 此帖于 Jan 31st, 2011 19:37 被 hugoo 编辑。 |
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Jan 31st, 2011, 18:51 | 只看该作者 #42 | |
软件基本靠载 硬件基本靠拆
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引用:
原理32楼说了,我同意。另外我们讨论的是不同的CABLE效果不同,你说的是不同的长度。 转一个关于HDMI的VIDEO:HDMI cable data is digital, but lives in an analog world |
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Jan 31st, 2011, 20:37 | 只看该作者 #43 | |
别当真
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引用:
他说的一点没错,但故意漏掉了最重要的消费者不会用到60m 的HDMI 线, 他Monster也不卖60m 的HDMI线, 而2m , 3m 的HDMI 线 ,$2 与 Monster 的$100 是无任何区别的。 还有你似乎对劣质线 产生的信号质量很大劣化, 对比Monster 高质线很小的指标劣化, 只要在Decoder 的容忍范围之内,最后解码出来的信号是一样的这一点,你一直不能接受。 比如最差容忍度的SPDIF,连纠码功能都没有,无论它的0和1变得如何的面目全非, 但在解码端,解码器还能认出来,最后的DAC 后的Analog信号,还是一样的。 就像这,这就是劣质线出来的效果,你是不是仍可以读出来,当然,就如你相信的32楼说的原理,所以SPDIF线的转输距离只有区区10m, 这10m意思是,这条线只要还是75 Ohm视频线,线材产生的信号劣化度,DAC端没问题! 我说你的线是坏的,当然是臆测,我只不过帮你分析可能的原因,难道你更接受Hugoo的猜测? |
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独乐乐,不若与众乐乐!
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Feb 1st, 2011, 00:02 | 只看该作者 #54 |
不堪盈手赠 还寝梦佳期
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这是个比较典型的误区,接收端即使正确识别了所有的0110,也无法保证解码出来的信号是一致的,理由我已经说过了,就是因为时钟信号也是同时传送过来的,而DAC都是基于时钟的边沿来触发运作的;时脉可以说是实打实的模拟信号,经过传输一定有畸变,边沿变差都属于自然现象,你再怎么整形,在传输中丢失的信息也恢复不了了,所以改善传输条件(屏蔽、换线)就是保证时钟精度唯一的办法。我刚学数字信号的时候问老师一个白痴问题,既然我们知道源是44.1K,为什么还要送时钟呢?用本地时钟不就好了?老师白眼一翻,叫我回家自己想 另外,数字同轴有严格的阻抗要求,是75欧,而市面上大多数的Audio Interconnects即使用了75欧的同轴线,RCA接头的阻抗也不是75欧姆,所以专业设备都用BNC。 |
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Feb 1st, 2011, 07:57 | 只看该作者 #55 |
Senior Member
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过机线银线和铜线的差别还是很显著的。silver streak vs. kimber 1016 或 anti cable 或 AQ King Cobra. 说实话,热插拔我还是有些心疼的,喇叭线就不做AB对比了,我对比过喇叭线两次,真空管就暴了两次。 那位也有weiss dac2的也出来吆呵一下 另外可以参考这个贴 http://www.jd-bbs.com/viewthread.php...ight=%2Btw1812 此帖于 Feb 1st, 2011 09:10 被 silent_fish 编辑。 |
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