KEF LS50 Wireless Internal vs External DAC ??

Might as well use a dsp to that allows you to color the sound to your preference before it is sent to speakers. 

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I tested he analog RCA inputs vs the PC inputs again.

The analog RCA inputs fed by my Aries Femto streamer > Yulong D8 [highly modified] DAC sound way better than the Aries straight into the PC [USB] inputs or using the KEF app as a streamer.

It is not even close....there is so much more warmth, realism ...everything improves through the analog inputs even though I know the analog signal is resampled by the KEFs DAC .

Obviously this analog signal I am sending the KEFs is of a much higher quality then the one decoded by only the KEFs DAC.....

The ADC in the KEFs seems to be incredibly transparent and lets in any benefits from using a high end streamer and DAC

..another advantage of using the RCA inputs is that one can take full advantage of the DSD and upsampling features of an external DAC instead of being limited to 192 on the USB input...

By running analog into the ls50s, all you are doing is adding a conversion from analog to digital to the signal chain (assuming this source has a digital out). That digital signal is then sent to the same dac that the digital inputs on the Kef route to. All the kefs dac limitations are still in play. There is no native dsd benefit to be gained, no way to bypass the 192khz ceiling. 

The best explanation for these various reports are pyschoacoustics, and that you are hearing what you want to hear. This can be an extremely powerful phenomena.

For those of you unwilling to accept that, then all that is left is that whatever sonic signature the analog source has, is being captured by the analog input, converted to digital, and then preserved all the way through the signal chain to the drivers. There is nothing “gained” here, nothing added other than the sources “color”. 

These are very 

I am not a big fan of all-in-one solutions for example this speakers it's usually a compromise and I will never consider such speakers solution ,the best way is regular speakers and seperate dac and streamer unless you are in a limited budget and you are willing to compromise the sound quality.

as usual lots of answers from people that do not own the speakers, have never tried them or even listened to them...:)