Is there a way to improve the sound?

I listen to turntables as well as digital ,for someone to make a blank statement records are better is total system dependent 
dynamic range far better at least 20-30 db more capable 
the most bits a turntable can produce is roughly 12.5 not even basic cd standard ,noise floor S/N ratio not even close the analog 
sound and resolution good digital has very much so .i play my flac
files directed through my iPad off a dedicated player 
for example a Outstanding buy Schiit audio ,sold direct.
the Multibit Gungnir, $1300 dac, or their top dog 2,300
these multi bit dads are their design 21 bit is max that can be extracted at the moment . Go read their white papers .these 24 bit 
dads,and 32 bit are all in theory. It is what is the end readable amount Mike misfit ex Theta digital engineer using their own design using Analog devices chipsets. Are without question 
unbeatable even at 2-3 x their prices and many awards.
that being said you need quality cables , power cords 
and digital cords .now these little regen units clean the 5v that corrupt the digital signal. Up tone regen plug it in and here the difference.with these days or , the Vacuum tube$5k Lascala ,
or $7k . Lampuzator any of these will player beautiful analog sounding music ,without the hassle !!

Mike Moffet is such a funny guy he would probably laugh at the auto-correct of his mane to Mike misfit. I'm also getting tired of some people saying vinyl is clearly superior to digital when they own $40,000 turntable setups and a $300 CD player.

The NDS/Uniti employs its own software that allows for pretty comprehensive use of metadata with the WAV files; aside from requiring much more storage capability, there is no disadvantage to using WAV files with the NDS.  The original poster mentions having the NAIM ripper, so presumably he is ripping and storing in WAV unless the means of storing is set up so that the files are converted again to some other format.  

At this price point, the sound should be quite good, so it appears that there is some kind of problem that should be sorted out.  

I like the sound from the NDS (I own and use it), although I actually slightly prefer the sound of the 555 cd player.  The NDS sounds more like current high-end digital sources, the 555 cd player sounds weightier and more old school (more like analogue sources).

I use Tidal too.

The audio stream website has been very helpful in tweaking my system.  Mike Lavorgna is quite knowledgeable and has online tutorials/articles about how to properly set up a system.  Good luck!!   I also have a very good analogue setup and believe that both vinyl and digital can sound very good depending on the mix/mastering of the piece of music.