Intona USB Isolator测试，结果被辣鸡笔记本恶心到了

gebegebe

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.

关于USB链接不同电脑或数播音质不同：

我的解码可以容忍高达2uS的jitter，而测试结果并无不同。异步USB意味着时钟基于解码，所以音源Jitter不是个问题。

我觉得不同转盘音质不同，主要源于音源产生的两类干扰：射频噪音和相关电流噪音。

解决方式是做电气隔离，之前没有隔离的机器（Hugo等）能轻易听出音源差异。另外，光纤与USB的音质几乎等同，也是因为光纤显然能做到电隔离。（他曾说平衡数字线路是造成音质问题的原因之一，所以DAVE多达四组BNC数字输入，两组光纤输入，而只有一个AES口）。

---unquote---


结论2：E530数字输出也有底噪，静止音乐状态下DAVE音量调到-10db以上会有比较明显的底噪，0db就很大了。别问我FOOBAR ASIO怎么设置，DAVE驱动没这个东西。
结论2.1：简单试了下，换了不同的笔记本电源（线）和不用电源（即电池供电），共三种情况没区别。

结论3：Intona USB Isolator前面的USB线作用明显大于后面的USB线，USB线1>USB线2

最后感谢激光鼠提供大U鼠试听，感谢熊猫视听提供Intona USB Isolator试听。

gebegebe

Intona USB处理器完全无法消除转盘的底噪