2-bay NAS for 4K movies
The 4K files are very tech demanding video format. Your setup will need to be ready to transfer these very heavy files. There are two options for you to stream 4K- over HDMI or network. But when you stream over the network, make sure you have everything wired using cables. If you prefer using WiFi, then you need a new generation 5GHz router. Or you can choose a NAS with transcoding engine built in. This will allow you to stream 4K movies over a slower network. The streamed file will be converted into a smaller version depending on network speed or destination device.
NAS for 4K playback over HDMI
Streaming over HDMI will not require a network connection, and require NAS to be located close to the TV.
TS-253Be, TS-453Be, TS-653Be
NAS for 4K over Gigabit network
Cast it on your TV or Chromecast device or play it over DLNA connection, DS418
NAS for 4K transcoding
Using video streaming apps like DS Video on Synology and Q Video on Qnap.
DS218+, DS418play, TS-653Be