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發表於 2019-2-21 22:52:26
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本帖最後由 Siegfried 於 2019-2-21 22:55 編輯
Unlike Cybershaft, Grimm does not publish official specs on its phase noise, Allan variance, etc. There is one graph inside its instruction booklet [see post 1483 below]:
https://www.head-fi.org/threads/ ... udio.806827/page-99
Another unofficial measurement I have found online is this:
https://blacklionaudio.wordpress.com/tag/grimm-cc-1/
[it is comparing its clock to Grimm, and obviously promoting its own brand, so not sure how accurate the measurement is]
But Grimm claims CC1 to be (one of the?) most accurate master clocks money can buy. And many international master studios use it. This may mean something.
I don't know much about the technical details behind. But I tend to agree with Grimm's White Paper that signals from a 10M clock will have to be converted to 44.1 and 48 before they can be used for audio. There are many unknown factors (the PPLs, more cabling, etc) during conversion. It will be interesting if people can measure the resultant phase noise, etc. when, say, the sine wave signal from the superior Cybershaft OP-20 (with phase noise of -120dB@1Hz!!!) is converted to 44.1 square wave signal through the Vivaldi clock.
Grimm gives 44.1 and 48 signals DIRECT from its outputs (with reasonably low phase noise, I believe). So, I think there is some guarantee in quality.
And... there is one more advantage of Grimm vs Cybershaft. It takes days or weeks for a Cybershaft to reach its peak performance. If it is unplugged, one will have to wait for a long time. Whereas for Grimm, it only takes 15mins to 30mins to reach a reasonable level. |
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