|
|
被你引来引去的文章，看人家的结论：
/ f5 a# d4 m$ p9 n1 LObviously, 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.
& p3 K8 ~$ o5 H! i
* ]) }) i5 H: s" y4 r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。4 o$ p' d, f4 \
- ~/ i) s( B4 `4 A. V6 a) P9 ?( ~% c) k
It 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# c3 Y9 P; B# b* a
1 n/ R/ J; G T y, ?! u h% V5 O
即便是五金店卖的8号线，在50khz也不过是1db的衰减。
8 L0 I1 ~8 b6 i& f: p注意了，人家比的是图21里红绿线的差值。
- S" j$ u: D: E
; @( ]$ @7 x) b, 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.4 j5 y% d! K7 e+ L4 T! U) {( z
, G; x G" J% a! L! [% k# K3 A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。 |
|
IP卡
狗仔卡
发表于 2010-1-15 14:28
显身卡
