XLR or RCA for my new DAC

You only really benefit from balanced cabling for EMI noise issues and/or long (+ 2 m) runs. I use it every where I can but it will cost ya (except for Morrow.)

Only for long runs is one of many incorrect answers when it comes to hi end audio

Both I/Os need to be TRUE balanced to benefit, though

A good pair of shielded RCA cables.

  I only used the XLR on my older QSC amp which had only xlr connections. 

 Then you will ask which rcas’ are better, etc.
you may or may not hear a difference.....I heard a difference using silver rca cables, switched back to standard rca’s. the highs were more out front but I found a good shielded pair from Blue jeans.And to save myself, I ordered them in a nice Kelly green color to make the wife happy. She likes green.

 Try out a couple pairs to see which ones give you what your looking for.  I went through 3 pair to find the ones that gave silence through the tweeter.
 We live 1.5 miles from a radio station tower, so there is talk and such.   After the better shielded rca’s were installed, it is much better now.  

Happy hunting.

 There is an ocean of cables, from 8$ - to thousands.
as I’m a budget audiophile, I found my old audioquest cables in the basement years ago, and still use them. I like them, if you get a proper shielded pair.

 Plus audioquest has their lifetime warranty, which I used about 3 -4 years ago on a nice XLR cable pair. 
Pulled them to use, they must have been 20+ years old or more, sent them in, fixed like new and returned, no charge.
that is why I buy them.

you may like other cables.

 Let your ears be the judge.  
 Enjoy, I always liked swapping cables, it’s easier them swapping components.  :)

Who said only for long runs?
Had to look up 1582.  
Processor?  
It's a stereo power amp.
A preamp will make more of a difference than any silly cable call.