标题: Intona USB Isolator测试，结果被辣鸡笔记本恶心到了 [打印本页] 作者: gebegebe 时间: 2017-8-6 15:45 标题: Intona USB Isolator测试，结果被辣鸡笔记本恶心到了 本帖最后由 gebegebe 于 2017-8-8 15:12 编辑
Intona USB Isolator 耗电较大，IPAD PRO 10.5无法使用显示耗电太大，刚好身边没有像样的电脑，只有一台联想笔记本E530做测试。
没有任何优化的E530C实在是太恶心了，原本准备插拔100次来测试Intona USB Isolator，受不了了最后只对比了大概三十次，只使用了DVAVE-SRM717-SR009系统。
结论1：DAVE还是受转盘影响的，Rob的回答我就当做放屁。
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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.