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yupoet

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对比的USB转同轴处理器有：

0404 USB
乐之邦Monitor 01USD
Teralink-x
M2Tech hiFace
Jkeny’s modified Hiface
何庆华 Audio-gd Digital Interface

总共是两篇E文：
1. http://www.head-fi.org/forum/thr ... -x-vs-m2tech-hiface
2. http://www.head-fi.org/forum/thr ... rs-shoot-out-thread

Pictures of my system:







[ 本帖最后由 yupoet 于 2011-1-10 17:29 编辑 ]

yupoet

先是这位”名嘴“的测试系统：

System Used :
Main Chain :
Foobar 0.8.3 (KS and Otachan ASIO) --> Wireworld USB Ultraviolet --> USB TO SPDIF converter --> Hi-Fi Cables & Cie Sobek or 18 ft. Belden 1694 BNC Cable --> Audio-GD DAC-19MK3 --> Hi-Fi Cables & Cie Khnoum RCA interconnect --> Audio-GD C2C (w/ upgraded pot) --> Moon Audio Blue Dragon V3 cable --> Sennheiser HD-650
Usb to spdif converters :
EMU 0404 USB
Musiland Monitor 01 USD
Teralink-X
M2Tech hiFace
Power related accessories :
Hi-Fi Cables & Cie PowertransPlus Power Cords
Supra Mains Block
Essential Audio Tools Parallel Filter
Vibration Control :
E&T Spider Rack, Vibrapods, Vibracones, Sandboxes, Brass cones, Acrylic and Fiber carbon sheets,
Herbie's Audio Lab Tenderfoot, SuperSonic Component Stabilizer
Other gear :
Sources : Creative Audio 2ZS Notebook, EMU 0404 usb, Zero DAC, Audio-GD DAC-100
Headphone Amps : Little Dot MKIII, Audio-GD ST-3

yupoet

Introduction:

Over the time I accumulated a few usb to spdif converters commonly discussed on head-fi, so I decided to write a comparative review of those units. Granted it is a bit tricky to describe the sound of a component that exclusively does its work on the digital level, however the differences do exist and I tried my best to describe how they compare to each other.

在一次我积累了一些常用的USB SPDIF的头部- Fi的讨论转换器，所以我决定写了这些单位的比较研究。诚然这是一个有点棘手描述一个组件，专门执行其工作水平的数字声音，但确实存在的分歧，我尽我所能来形容他们是如何互相比较。



Jitter - theory :

There has been a lot of things about jitter. I found an interesting article here on TNT-Audio explaining jitter and the difference between transmitter jitter, line induced jitter and interfering-noise induced jitter.

There is a theoretical advantage of using a usb to spdif converters instead of a direct usb connection to the dac is an added layer of isolation and "jitter rejection". Below is a quote from an email exchange with Marco from m2tech : "S/PDIF receiver which, you certainly know, has a feature which is "jitter rejection", a figure that typically ranges 20 to 30dB: this means that the input jitter to an S/PDIF receiver is reduced by a factor of 10 to 30... 970ps become 100ps quite easily."

This might explain while I found that all 4 units performed better than the direct USB inputs of the USB dacs I have.
I even found out that when using the Musiland as a transport (using optical) for the EMU 0404 USB it gives better results than its USB input.

(Edit -- The intent of this thread is not to discuss jitter theory or treshold audibility of jitter. Please read the following post http://www.head-fi.org/forums/f21/do...-forum-227350/ before posting on those topics.)


有大量的关于抖动的东西很多。我找到了TNT电视台音频抖动有趣的文章，解释在这里和发射器之间的抖动，抖动和干扰诱导线噪声引起的抖动的差异。

有一个使用USB到SPDIF的，而不是直接的USB连接到DAC转换器的理论优势是隔离层，将“抖动拒绝“。下面是从与马可从m2tech电子邮件交流名言：“S / PDIF接收的，你当然知道，有一个特点就是“抖动抑制“，这个数字一般为20至30分贝：这意味着输入抖动一个S / PDIF接收器是减少了10倍至30 ...970ps成为100ps的很容易。“

这或许可以解释，而我发现，所有4个单位的直接表现优于在USB输入的USB DAC的我有。
我什至发现，当使用传输（光）的动车组0404 Musiland为它提供的USB USB输入比其更好的结果。

（编辑- 此线程的目的不是讨论理论或treshold抖动抖动可听请阅读以下文章http://www.head-fi.org/forums/f21/do...-forum-227350。 /这些主题之前发布。）

yupoet

Test Protocol :

Before writing my review, I did many A/B tests going back and forth between different units. And besides those A/B tests, I also did extended listening with all those units to get more familiar with their sound as sometimes

To make sure I was not adding any unforeseen parameters, for each A/B test I would use the same usb port, the same usb cable and the same digital cable (used in the same direction).
I did try various digital cables but did most my listening with the sobek digital cable as I was very familiar with its sound. For those who might think that digital cables do not matter, you can find Here a link of an old stereophile article that measures the jitter of various digital cables which show that even the direction of the cable can affect the sound. During my test I tried to beconsistent comparing units with the same digital cable (used at the same direction), and then compared again the units with a different digital cable.
I also tried different usb cables but I ended preferring the Wireworld Ultraviolet usb cable. I did most of my testing with that usb cable except with the m2tech who doesn't need a usb cable.

之前写我的检讨，我做了很多的A / B测试将不同单位之间来回。而除了那些A / B测试，我也做了长时间聆听所有的单位，以获得更多与他们的声音非常熟悉，有时

为了确保我没有加入每个A / B测试我会使用相同的USB端口，相同的USB电缆和相同的数字有线电视（在同一方向上使用）任何不可预见的参数。
我曾尝试各种数字电缆，但并是我最大的有线数字电视的索贝克听，因为我是很熟悉的声音。对于那些谁可能会认为，数字电缆并不重要，你可以在这里找到了一个老stereophile文章，对各项措施表明，即使在电缆方向可以影响声音数字电缆链路抖动。在我的测试我试图beconsistent比较单位与同一数字有线电视（在同一方向上使用），然后再比较用不同的数字有线电视的单位。
我也尝试过不同的USB线，但最后我更喜欢Wireworld紫外线的USB电缆。我除了与m2tech谁不需要USB电缆我与大多数的USB电缆测试。


Ease of use & Drivers :


EMU 0404 USB :
The EMU 0404 usb is a very versatile unit. It can be used as a DAC, headphone amp, and also a USB to Spdif converter. However, it requires custom drivers and the digital output works only with ASIO.
It has optical and rca spdif output but it lacks a BNC output which might be a drawback for some.
The EMU can do 24/192 thanks to its custom drivers.

该动车组0404 USB是一个非常灵活的单位。它可以作为一个DAC，耳机放大器，也是USB到SPDIF的转换器。但是，它需要定制驱动器和数字输出只能与ASIO的。
它具有光学和RCA SPDIF的输出，但它缺乏一个BNC输出，可能是一些缺点。
该动车组可以做一百九十二分之二十四由于其自定义的驱动程序。


Musiland Monitor 01 USD :
The Musiland is a wonderful little unit. It needs custom drivers that work up to 24/192. It works with DS, KS and ASIO so that it can be used with any player.
It has BNC, Spdif and optical out. I am currently using it with the 1.0.3.2 driver and it works flawlessly.

该Musiland是一个美妙的小单位。它需要的工作最多192分之24定制驱动程序。它的工作原理与DS，堪萨斯州和ASIO，以便它可以与任何播放器。
它有BNC接头，SPDIF和光纤输出。我目前使用的1.0.3.2驱动它和它的作品完美。


Teralink-X :
The Teralink is the easiest to use. It doesn't need custom drivers and works with Direct Sound and ASIO (through ASIO4ALL).
It has I2S, BNC, Spdif and optical out. This one is a "plug and play" unit that performs flawlessly but is limited to 16/44 and 16/48.
It is possible to install custom drivers (thread here) but there are no sonic benefits in doing it (those drivers introduce many additional processing to the sound which I found to cause a degradation to the sound in my opinion).

该Teralink是最容易使用。它不需要自定义驱动程序与直接声音和ASIO（通过ASIO4ALL）和作品。
它的I2S，BNC接头，SPDIF和光纤输出。这一个是一个“即插即用“的单位，执行完美，但仅限于16/44和16/48。
它可以安装（线程在这里）自定义驱动程序，但它有这样做（那些司机引进了许多额外的处理，发出的声音，我发现导致退化的声音在我看来）没有声波的好处。


M2Tech hiFace :
The M2Tech hiFace is a very minimalistic unit : it has only one output (I ordered mine with a BNC output) and it plugs directly into a usb receptacle without the need of a usb cable. For now, it has only drivers that work with Kernel Stream and it works with Foobar, Media Monkey and WinAmp.
DS and ASIO drivers are expected later down the road.
The unit does 24/192.

该M2Tech hiFace是一个非常简约单位：它只有一个输出（I排列的BNC输出地雷），它插在USB插座的情况下直接将USB电缆的需求。现在，它已经以kernel流和它的工作与Foobar的，媒体和Winamp的作品只猴子的驱动程序。
DS和ASIO驱动，预计以后在道路上。
该单位即192分之24。

（抱歉，只能用google自动翻译了）