CD Transports

The I2S format that PSA and Wyred4Sound use transfers the clock and datastream separately from transport to DAC. The result is less noise/interference than S/PDIF, USB, optical which transfer all signals together.
An HDMI cable is used to carry the individual streams.

I used it between PS Audio components and found it to be very smooth with low noise, presenting a realistic image.

@twoleftears1 See  my post above. We also had the NuPrime used s a transport.  The results were that it had very nice detail, very open and a nice balance top to bottom but overall it is not what some would call musical.  It took away the fullness of say the piano or stand up bass so it was a trade off between the other CDPs we used as a transport or by themselves.  Happy Listening. 

Nuprime  is using unusual design their CDP can be up sampled to PCM and DSD, from 44.1kHz to 768kHz or DoP256,The conversion is achieved by up-sampling to mega hertz before down converting to the targeted sampling rate .I think this approach might harm the sound .

Look into Jays Transport 
i think its the best Transport out there.

The optimal solution IMHO is to locate a PS Audio DMP player and connect it to a PS Audio DirectStream DAC. The results are nothing short of astounding. It is truly in a class by itself. The challenge is that since OPPO closed shop, the company no longer has access to the transport drives it was buying from OPPO. This is why you’ll see the item “Unavailable for purchase” on their web site. But if you can find a dealer with an I sold unit or a unit on the used market in good condition, run don’t walk.