北漂彰化人 wrote:
說實在的,有很多人真...(恕刪)
對於分不出來就不用揪結了，像我媽覺得Lexus 跟Porsche 都差不多，但對於有些人，這跟本差很多，覺得有差的人就多花錢，對於無感的人，就是浪費錢而已。
Alessandro Lee wrote:
有誰能解釋，為什麼DAC接到電腦的那條線線材能改變音質？
答案就是
1. 你的USB線有問題 (沒USB認證?) 一般認證USB CABLE 就夠了
2. 你的DAC 有問題, 對 USB DATA 和 電源 噪音(NOISE) 很敏感, 可以換一個合格的 (不見得是貴的)
看了一堆"有信仰"的人的回覆, 也嘗試用科學的角度來解釋 供大家參考(借用一下國外的論壇資料 Do USB Audio Cables Make A Difference? )
以下是國外一個論壇大師的實驗 (不同DAC 不同USB cable 得到的真實數據)
結論大概是
1. 其中一個DAC 設計很爛, 對 USB 的電源和資料"噪音"(noise)很敏感, 所以不同USB線 DAC出來的音質有很大差別. 但是測試的另一個DAC 沒有這種問題 (貴的 便宜的USB 線表現相當)
2. 作者認為就算爛的DAC因為設計爛, 就算有這種音質上差別,也只會顯現在噪音上(比如click 聲), 不認為導致像音場 音質 這種"音色"上的變化.
Summary
For the first time anywhere, we have shown that we can change the analog output of a DAC by changing how we feed it in digital domain in USB. Shorter cables provided improvements that were visible. Alas, two other factors conspire to make this non-news:
1. Schiit Modi 2 that I have tested is horribly designed. It is sensitive to both USB power and data noise. Even a cheaper DAC like Behringer shows that such sensitivity is due to poor DAC design than anything to do with USB cables. The Behringer performance is better than Schiit with any cable and shows no need for tweaking the USB cable.
2. I have hugely magnified these differences. Without this magnification, the differences even with lousy DACs like Schiit are literally in the noise.
So nothing here explains the fantastical subjective differences people report between USB cables. I suggest those people conduct some blind test to get to the truth of whether they are hearing any differences especially if they are using better DACs than Schiit Modi 2.
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