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发表于 2007-12-26 23:57:21
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根据Elias Gwinn, an engineer at Benchmark Media的说法，凡是需要安装驱动程序的接电脑的DAC（看白版的帖子，好像miniDAC要安装驱动程序），都做不到bit transparent。声音质量会受到影响。可以浏览下面的链接：
http://forum.stereophile.com/for ... amp;an=0&page=0
当然他也代表商家，不过多听不同的观点，可以帮助大家了解更多一些。
下面摘录了一部分。
I'm Elias Gwinn, an engineer at Benchmark Media. I wanted to answer the questions you have posted here.
The USB interface on the DAC1 USB is truly capable with 96/24 streaming audio. In fact, when using the DAC1 USB to playback audio, it achieves the same performance as the other digital inputs. Therefore, we do not discourage using the USB interface whatsoever.
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Am I correct that USB is natively limited to 16/48? How do you stream greater resolutions using the native drivers? I am not trying to get proprietary information, I just thought this wasn't possible using native drivers.
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Native USB is not limited to 48/16. In fact it is only limited by the bandwidth of the USB protocol. That is, USB 1.1 or 2.0. USB 1.1 is limited to 96/24. This is true for native and non-native.
The reason native USB is commonly believed to be limited to 48/16 is because the typical off-the-shelf USB solution for audio devices could not stream more than 48/16. The solution used in the DAC1 USB was engineered from scratch to utilize the 96/24 capabilities of USB 1.1, and it is the first to do so, as far as we have found.
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How are you dealing with jitter over USB? From what I have seen jitter is much greater over USB than the other interfaces. I know that the DAC1 stores the data in a buffer and reclocks the data. Is there anything special done for USB data? Why is word clock jitter rejection of USB transmitted data harder to accomplish?
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Yes, jitter is a very serious matter with USB. In fact, one interesting piece of information we found (though we did not confirm) is that computer manufacturers will ADD JITTER to their clocks for the purpose of spreading the energy across a wider bandwidth to pass emissions testing. Apparently the spike at the fundamental clock frequency was causing interference of some sort.
The DAC1 USB is well suited to handle this jitter utilizing the same clocking technology that made the DAC1 so successful...UltraLock. With this clocking system, the DAC1 will perform exactly the same no matter how much jitter is on the clock...quite literally. There aren't too many converters that can make that claim, but we encourage you to compare.
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What is the difference in the outputs between the USB version and the "regular" version? That is, what is the high current output? Is this simply a lower impedance output?
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Yes and no...the DAC1 USB has low impedance output, but its much more then that. Even low-impedance outputs will suffer from THD when it has to drive low impedance loads, high capacitive loads, and/or high inductive loads. The DAC1 USB is designed to drive these loads with no loss in THD performance. We refer to them as "High-Current" outputs because these loads require a lot of drive current, which will usually cause the THD to suffer. The DAC1 USB is designed to handle such loads without affecting the performance.
下面这个链接内容更丰富，全是与DAC 1-USB相关的技术分析和用户体验的帖子，得花一点时间读。
http://www.head-fi.org/forums/f7 ... 23006/index115.html
[ 本帖最后由 fgpgp 于 2007-12-27 00:02 编辑 ] |
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夸张了.PCHIFI那简单就出好声就好了..,,,,,白斑的听感能比的上2万的台机了吧.....呵呵.虽然我是玩PC的
