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原帖由 hjshan0001 于 2008-1-6 00:01 发表 
说老实话,盲听的状态下,很多时候我连换运放都分辨不出!但他们确实是有分别的。
doesn't that tell you something?
if there are differences that make no difference to you, why do you care about the differences?
if you have the opportunity next time, take the cover off a recording mixer. if that is a high quality mixer, you may be able to find lm324 in its signal path. or maybe a tl07x/08x opamps there - and that's where pretty much all of the CDs are mixed.
there was a demo at the NYC AES (audio engineers's society) meeting some 10+ years ago where someone showed two devices, one is 25 u741 chained together, and another is a copper wire, all consealed in a box, and ask the listeners if they could tell them apart.
The result?
no one could consistently tell them apart.
Professor Leach listed an experiment report on his website. in that report, 25 avid tube fans were put to a test on a high quality tube amp and a solid state amp, level martched and frequency response matched. none of those guys could tell the tube amp / solid state amp, except one. and that guy did it by listening to the hum in the tube amp. |
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