Dear All
I spend several hours yesterday evening to test a huge number of option to compare the SQ of each steaming/dac solution.
History :
I moved month ago from a SN/Hicap/PL + SB3 + Harbeth C7se3 to a NAc282/HiCap/PL SN(Power only) + SB3 + Harbeth C7se3. So i lost the SNdac that had a significant impact on the Sb3
. So was looking to see how to improve the Streaming side to take all the benefit of the very nice Nac282.
So the option tested was :
1) SN/SB3 (Without SNDac)
2) SN/SNDac/SB3
3) SN/nDac/Sb3
4) SN/Nd5x
5) SN/Ndx
The idea was to stay as simple as possible with also looking for a pragmatic approach and cost. It's why the NDX or Nd5x + nDac was out of scope.
So the result (mine) was the following :
1) I know this sound : Narrow soundstage, flat (2d, like a picture) ,boomy bass without detail, high sometime aggressive.
Overall : A purly numeric sound (Naim is not needed here, a entry level Amp would be more than enough
)
2) I know this sound as well : Better Image, bass with more punch, High a bit smoother too.
Overall : Good sound when talking with friends but frustration during intensive listening session (Cd5X+Flatcap) is a lot better. (Ndac is really nice for the SB3 if we accept the SB3 limitation in term of SQ
)
3) Ok, NDac is doing his best, soundstage larger that before with more definition, picture still a bit 2D so for me it's clearly the SB3 that is the bottleneck and the "bad guy", so not really impressed by by this configuration (at least not enought to buy a nDac for my SB3
)
4) Yes..looks lot better, i like this sound, deeper, the image is now 3D (impressed be the difference with 3...2 sec was enought) with a lot of rythm. The PrAT is here, the soundstage is larger than 2 but not as large as 3. Could leave with such config. 
5) Gosh...yes the price is higher but.....but the sound is just amazing, Deep, 3D, large soundstage. Wonderfull PrAT and was just immerse in the music, connected to the sound, the emotion
. I
was totally convince about this wonderful piece of HW.
Result: NDX ordered

Was a very nice evening, with very good music, wine and lot of emotion..tks to "O" my friend 
Hope helps, but as usual listening is key...
Phil