次世代訊源PK賽及深入分析

[sp007]

16/48 有點弱耶............

[Leo Yeh]

官方對USB的說法

An important note about the USB input

The USB input on the MOON 750D accepts a digital audio signal of up to 16-bits/48kHz. This is the native specification of the USB input. However, if you require a higher sampling rate, there are ways to achieve this with the 750D.

Rather than including a USB input for sampling rates exceeeding 48kHz, we opted to provide the best possible power supply, D/A converter and analog stage in the MOON 750D at this price level. Also, keep in mind that USB wasn’t originally intended for use with hi-resolution audio; there are latency issues which compromise sound quality (i.e. jitter and phase errors, etc.). These could be minimized through dedicated costly circuitry, but this would significantly drive up the cost of the 750D without improving the sonic performance on any of the other inputs.

If you intend to use the MOON 750D’s USB input, it’s very likely that your computer is a data source for music. Today most computers with a built-in sound card will have either an S/PDIF (RCA connector) or Toslink (optical connector) digital audio output, thus eliminating the need for a USB input on the 750D. Furthermore, if you’re committed to getting the most out of the music stored on your computer, then in all likelihood you have installed an after-market soundcard in your computer. Virtually all of these soundcards have at least one S/PDIF, Optical or AES/EBU (XLR connector) digital output. At this point, USB connectivity becomes irrelevant. The USB input is there for convenience as opposed to performance.

In the event that you wish to use your computer’s USB connection with files greater than 48kHz, there are several relatively inexpensive after-market products; compact one-box USB-to-S/PDIF interfaces that will work with USB datastreams up to 24-bit, all the way up to 192kHz.

[kevintran]

我個人覺得Simaudio如果覺得USB port 不夠high end，還不如不要加這個USB port. 我個人覺得這種半調子的作法，只是損害商譽而已.:|

[chen3058]

我個人覺得Simaudio如果覺得USB port 不夠high end，還不如不要加這個USB port. 我個人覺得這種半調子的作法，只是損害商譽而已.:|

會不會是過渡產品阿，過沒多久又出新的或進階版:(

[Leo Yeh]

去年音響展訪問總裁Jean Paulin時，表示USB不是他們的選項，網路是他們認為比較High End的可能，會配備USB完全是消費者有需求下的妥協，而官方的聲明也表示在750D的價位，如果要在USB下功夫，一個就是要提高許多成本，不然就是犧牲許多其他基本的品質 (best possible power supply, D/A converter and analog stage)，當然，現有的數位介面其實已經很夠用了...

[kevintran]

是啊！我也覺得即使沒有USB的input，750D還是有足夠的輸入界面. 還不如不裝USB，加個同軸的界面，然後建議買家再多買個好的USB to S/PDIF的轉換器! 這樣成本並不會增加（還可能減少），買家也知道廠商是真心要把東西作到最好（750D 應該是旗艦吧？）.
老實說，我很難相信換個USB receiver 的IC和相對應的零件在成本上會增加多少。750D也不便宜呢。

[Leo Yeh]

目前聽過USB好聲的ayre與dCS，兩者售價都不低....
主要是會用到asynchronous USB技術，解決jitter等問題
High End音響要用零件算...是算不出售價的...

[sp007]

750D聲音好嗎??
用usb界面跟其餘數位界面,聲音有差嗎???

[Leo Yeh]

待我慢慢試試.......

[kevintran]

其實我最關心的是750D的聲音，這好像是少數用ESS Sabre 32－bit DAC 的廠家之一...... 期待.......