标题: 转载Chord DAVE设计师Rob Watts原文彻底终结USB线和电源线的争论 [打印本页] 作者: 德国大师 时间: 2018-11-19 23:52 标题: 转载Chord DAVE设计师Rob Watts原文彻底终结USB线和电源线的争论 Now the problem is definitely not jitter from the source - my DAC's can tolerate 2uS of jitter and it will have zero difference to the measurements - also the USB is isochronous asynchronous so the timing comes from the DAC clock, so source jitter is not a problem.
So I looked into the issue of different SQ with sources and found two sources of error:
1. RF noise.
2. Correlated current noise.
So the solution to the above problems is galvanic isolation. This means that RF noise from the source can't get into Dave, and small correlated currents can't get in too. And this approach gave two benefits - much smoother sound quality, and a deeper soundstage.
Now with Dave I can no longer hear which source is connected, but before without the galvanic isolation it was easy to hear. Additionally, optical sounds almost identical to the USB, as optical is clearly galvanically isolated too.
