Do I have to use a streamer/renderer to play music from an NAS?


I apologize for the basic question. But, I can’t seem to find an answer online. I would like to put all my CDs on an NAS and play that music through my system. I have a Rotel RC/RB-1590 set up. I know some NAS boxes come with DLNA software installed, and I am looking at Synology because I read their software for finding and selecting music to play is pretty good. Eventually, I will probably end up with something like a Cambridge Audio CXN or 851N to stream tidal and digital radio, as well as the music on the NAS. But, do I have to have the Cambridge or some other device to just play the digital music from the NAS to start? I would like to do the purchases in steps so I can get better units as I can afford them.  Also, any advice on alternative solutions would be much appreciated. Thanks.
kumakahn
I use a Raspberry Pi with Logitech Media Server, but Volumio is the popular favorite.

I use the USB interface straight. Works great, but you can also buy inexpensive S/PDIF or even analog outputs as well.

What I like about both of these solutions is the Android and iPhone support as well as a web interface.
You might also look at something based on JRiver or Media monkey, especially if you have an old laptop lying around the house.
It doesn't look like your preamp supports dlna, so yes, you'll need something external. A bluesound node 2i or something similar would work. 
My preamp does have a DAC. I think the main issue is how to push the music from the NAS to the preamp.
+ 1
at the bare minimum, you need a DAC.  Some how those 1s and 0s from the NAS have to be converted to sound.  I don’t know if the equipment you cited has a DAC.  Then you need to be able to tell the NAS what to play.
  A PC is a great way to start, most people have one lying around.  Great software programs for low expenditures can then provide you with a good GUI while simultaneously enhancing the sound output from the PC by disabling other functions.
You will need something to get the music from your NAS to your stereo. I have a Synology NAS and its Disc Station Manager does have an audio player that can play on my computer. But to get the music to my stereo I use an Auralic Aries Mini connected to an outboard DAC. That is the easiest way to get the music on the NAS to your stereo and there are various streamers. Cambridge is one of them, some folks like Chromecast Audio which is inexpensive but I believe its going away.  Good luck!