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被你引来引去的文章，看人家的结论：3 r+ d4 ~ P( \6 d; I8 x8 J* z
Obviously, the cable is just a pair of wires below the transition frequency, and your speaker cables (regardless of claims or cost) are exactly the same. In case you may want to simulate this effect yourself, I used DCR=1Ω, L=200nH and C=100pF per metre, and used a 100 metre line. A shorter line does exactly the same thing, but the frequency where it becomes a transmission line (rather than a couple of wires) increases as the line length is reduced. For a 10 metre cable, the frequency is 1Mhz, and for 3 metres this increases further to 3.3MHz. These effects were present in all the previous simulations, but were masked by the amplifier's rolloff.
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不管是同轴电缆还是你的音箱线，即便是以他用来计算的放得很大的模拟参数DCR=1Ω, L=200nH and C=100pF per metre，10米的线在1Mhz的频率以下都可以认为是理想传输线，3米的极限是3.3Mhz。# R% N( f& Q& s, m7 ]0 z
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* u! C: W4 O/ a+ j% _5 g; HIt is worth noting that none of these cables is 1dB down on midband level at any frequency up to 20kHz, and even the Figure-8 lead is only 1dB down at 50kHz - it is a rare tweeter indeed that will be anywhere near as good, regardless of price \, s) M0 `9 ~8 T3 ^' O, Y
$ h, H; M7 \7 B" ^8 N" m/ U即便是五金店卖的8号线，在50khz也不过是1db的衰减。5 v7 G y1 M6 T) `% {
注意了，人家比的是图21里红绿线的差值。
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, and the Goertz cable will set you back about US$200 a pair for 4 metre lengths (and maybe make your amplifier oscillate). Naturally, you can spend a great deal more (and still make the amp oscillate), but I don't see much point.) a6 M& L1 l; R- ~/ m- x! X
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由于它过大的电容，200美刀一对的好线可能会引起放大器反馈振荡（应该是这意思吧），尽管它在超出20k以上的频段取得了很好的频响拟合，但作者还是看不出它可取之处。 |
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狗仔卡
发表于 2010-1-15 14:28
显身卡
