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音响线材
这个谎言就是:高价喇叭线和信号线比标准或一般的线材有更好的声音。这个谎言已经在阳光下被诚实的权威人士一次又一次地戳穿、耻笑和驳倒。但许多无辜者却无从分辨。
高级音频线
最简单的事实就是:阻抗(R)、感抗(L)和容抗(C)这三个线材的参数,是唯一能够影响在声波频率范围内的性能的参数。信号根本不知道自己是被天价线材还是被便宜线材传送着。当然,你还要为一个做工良好的插头、屏蔽处理和绝缘处理等等付出一些代价,以保证线材能够可靠和稳定工作。还有就是你要注意线材不宜过长,避免阻抗过大,信号衰减过多。然而,在基本的导电性能中,一对优质的衣架刮掉两端拉直后,一点也不比价值2000美元的神奇线材差。18美分一尺的 16号电灯线也是如此。
天价线材是电子消费品中的一个最大的骗局。
https://mniec.wordpress.com/2012/10/11/snake-oil-of-the-year-award-audiophile-cables/
EMC Handbook (Kaiser)z Skin Depth of Copper at 20 kHz = 18 mils(dia: 16 ga = 50 mils, 12 ga. = 80 mils)z ‘Resistance’ of 12 ga. wire, 9’ = 41 mΩ (forthe signal plus its return path)z For 100 W & 8Ω speaker, I = 3.5 Arms(although speaker are rarely run at full load,usually only an impulse)z So the total loss I2R is 0.5 W or 0.022 dB
PASS 老头坐不住了:
CONCLUSIONS
Who am I to dispute the feelings of audiophiles who, evaluating any cable in the context of program source, amplifier, speaker, and listening room, decide they can hear the difference? A few guidelines have emerged here, but the final judgment belongs to the user. All the special cables mentioned worked well on the test bench and, given the assumption that series impedance should be minimized, all of them work better than 16 gauge wire. If, like many audiophiles, you have spent a small (or large) fortune on your hi-fi system, money spent for high quality cables and connectors is a reasonable investment.
REFERENCES
Brochures/Pamphlets:
Fulton Speaker Cable. Fulton Musical Industries, 4428 Zane Ave. North, Minneapolis, MN 55422.
Mogami Speaker Cable. At press time we are unable to locate a manufacturer or distributor for Mogami.
Polk Autio Sound Cable. Polk Audio, 1205 South Carey Street, Baltimore, MD 21230.
Ultra High Definition Speaker Cable. Audio Source, 1185 Chess Drive, Foster City, CA 94404.
Hiraga, Jean, "Can We Hear Connecting Wires?", Hi Fi News and Record Review, August 1977.
Retsoff, Alexander, "Retsoff's Remedies ," Stereo, Fall, 1978.
Klipsch, Paul, "Speaker Wire," Dope From Hope, Sept. 13, 1978.
Pass, Nelson, "Loudspeaker Damping," Audio Magazine,
Gailus, Mark, "Speaker Wire: What Size is Sufficient?", Audio Forum, Aug.-Sept.,
Greinier, R. A., "Another Look At Speaker Cables," Speaker, The Boston Audio Society, Dec. 1978.
Gross, T. A. G., "Multistrand Litz Wire Adds "Skin" To Cut AC Losses in Switching Power Supplies," Electronic Design, Feb. 1, 1979.
https://www.passlabs.com/press/speaker-cables-science-or-snake-oil
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关于线材
http://www.roger-russell.com/wire.htm
Roger Russell 是谁:
Author, Artist, Engineer, Inventor, Photographer, Collector, and formerly
Director of Acoustic Research
at McIntosh Laboratory, Inc. and the originator of
McIntosh Loudspeakers
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