External DAC connection for Bluesound Node 2i (after "Another streaming newbie" thread)


Guys, just following recent topic raised by chuckccs, I found myself in similar situation because I was comparing Bluesound Node 2i sound via its analogue RCA output with its sound via external DAC (M2Tech Young DSD with external power supply). Difference was really marginal, especially taking into account additional cost of external gear (DAC, cable, PS). I connected Node to DAC via coaxial output, however not tried the optical connection. 
From those who got substantially better sound from Node 2i via external DAC I would like to ask which connection they used (coaxial or optical) and which cable they recommend, maybe also which DAC they used too. Thank you!
apanhc
So I’m finally going to give the Node 2i a shot. I’ve been using a Line Magnetic 502CA DAC in both Tube and SS mode & like both presentations a great deal depending on the track and type of music it’s being fed. Going to try it with an Audience Coax cable and an Audioquest Toslink and see which I prefer. Wondering what people have found to be an alternative streamer to the 2i (<$1K) knowing that I will 100% be using the LM DAC and don’t need want the unit to have an internal processor,...
Audio Advisor is advertising a new version of the Node, you may want to check that out, same price.
Been reading a bit about the Auralic Aries Mini - seems to be similar to the
Node/Node 2 with no internal DAC. Anyone have experience with this piece? 
I just bought the Node 2i to replace my Audioengine B1 Bluetooth receiver and am blown away by the increase in sound quality. I am streaming Tidal Hifi into my Rogue Cronus Magnum and Totem Hawk Speakers and am currently using the Node 2i’s built in DAC. Now I am wondering if I can make another incremental increase in SQ by purchasing an external DAC in the the $500 range. I’d be willing to buy used. Any recommendations?