|
发表于 2009-11-6 06:46:15
|
显示全部楼层
原帖由 小白 于 2009-11-5 10:15 发表
开玩笑,CD机里还放两个不同的DAC? USB接入的信号要先经过一个解码芯片,再送入CD机的DAC.
我可能理解有误,下面是我前面提过的一个关于SA8003的帖子链接及部分引文。
链接:http://www.enjoythemusic.com/mag ... /marantz_sa8003.htm
“Don't Buy A Porsche For The Cup Holder
...and don抰 buy the SA8003 for the USB input. It works okay, probably as well as the cup holder in Porsche, but has enough issues to make it a more of an afterthought feature than a main event.
The USB input is powered by an NEC uPD63901 microcontroller (designed for use in car audio head units), and it enables the SA8003 to play MP3, WAV, WMA and AAC files directly off a USB hard drive, pen drive, or iPod (it does not function as a USB DAC, as connecting a laptop to the Marantz with a USB cable does nothing). The uPD63901 does its own D/A conversion, so files read from the USB input completely bypass Marantz' CS4398-based digital section (and cannot be output via the Marantz digital outputs). The USB signal still benefits from going through the SA8003's discreet analog output stage, but overall the USB sound is not quite up to par with what the SA8003 does when playing a shiny disc. Of course, this hardly matters unless you are using full-resolution WAV files, the only lossless format playable on the Marantz.”
[ 本帖最后由 lus12 于 2009-11-6 06:48 编辑 ] |
|