Is the marantz 30N or ruby almost a universal player

I think there may have been a miscommunication. That player can't play DVD-Audio (also known as DVD-A) discs. According to the manual the discs it can play are SACD, CD, CD-R, CD-RW, and DVD-R/-RW/+R/+RW. The file types it can play are MP3, WMA, AAC, WAV, FLAC, Apple Lossless, AIFF, and DSD. All those file types can be played on the various types of writable DVD discs, and all but DSD files can be played on the various types of writable CD discs. For the complete information about resolutions see page 127 of the manual, which I found on the internet. 

FYI the 30N MSRP is $2500 and it is NOT a balanced product. Technics newest (2+ years) is incredibly well engineered AND has true balanced outs



hth

This doesn't get the love it deserves.
https://www.technics.com/us/products/grand-class/network-super-audio-cd-player-sl-g700.html

Does the technics play  dvd-r discs o have hundreds  made on my pc with high resolution files

Technics doesn't do DVD at all.

From what I can see, the Marantz handles DVD-R but *not* DVD-A.