This is super helpful! Will try it out right now and see how it turns out.
As for Yulong's website there isn't really one as far as I am aware of, except for a sub-forum of the erji.net. http://bbs2.erji.com/thread.php?fid=150
You could try reading it using google translator, or you could tell me what you are interested in and I could try searching it for you.
So far it appears to me nobody is using the D18 to anywhere near its full potential.
The D18 does not have an upsampler built in (and I'm not 100% sure but I think also no PLL jitter attenuation etc, other than what the Sabre DAC itself does)
The proper way to use the D18 is to upsample the music on the computer to 192Khz 24bit (or 32bit) and use a very high quality asynchronous USB to AES/EBU or spdif converter with low jitter like the Audiophileo2, Stello U3 or M2tech EVO.
The computer can upsample better than any included upsampler in any DAC, also in real time (SOX for foobar or cPlay for instance). Set it to linear phase with 99% bandwidth for correct upsampling (not nonsense minimal phase which has nothing to do with reconstructing the original wave according to the sampling theory upon which digital audio is built).
This upsampling will give you better than 175dB THD+noise, this is inaudible.
The difference between doing the above correctly and simply streaming 44.1 Khz audio through a mediocre USB-spdif converter (or directly from a cd transport) will be huge.
Btw, to make it lighter on the computer one can also upsample 44.1Khz audio to 176.4Khz instead of 192.
edit: here is a link to the SOX resampler for foobar2000: http://www.hydrogenaudio.org/forums/index.php?showtopic=67373 simply unpack the zip to your foobar2000 components folder and then in foobar load and configure the resampler under preferences - dsp manager.
Edited by Philharmoniker - 12/21/11 at 1:28pm