anyone heard digital transport?

well, can you all talk about the spread but other topic?

I don't think you will get much digital design help here on this forum.

nop，but i only want to talk about digital transport about someone,because I think PC and cdplayer will not the future of hifi music player,only digital transport is.

I have been looking into the Astell & Kern AK 100($700.00USD) and AK 120($1300.00USD). They are portable digital headphone units with internal storage and can have micro SD cards inserted for more content. The AK 120 boasts Dual Wolfson Dacs that can handle all music formats as well as HiRez DSD. The unit can be used as a source for home stereo with a mini to full size RCA cable and as transport from the mini headphone jack with a mini to full size optical cable. A very flexible piece of gear at that.
Think about it you can load all of your music onto a hard drive or iTunes, and transfer it to a number of micro SD cards that will play as a portable headphone player, optical digital transport and as a source for listening on a home system. All of this can fit in your pocket! Also the digital signal is extremely clean and rivals many super high end transports.

http://www.astellnkern.com/

I touched AK120 several month before, as I konw ,it is not the best sound because it made by DSP. And I know some production like QLS350 use singalchip microcontroller, that structrue can reach better effect.