So i have a Jamo 5.1 surround system hooked up to my sony sdr de515 amp. Its quite old so no HDMI or anything like that only RCA out. At the moment i just have a rca left and right to aux into my laptop and stream 4k stuff through there on my https://www.kogan.com/au/buy/kogan-50-4k-hdr-led-tv-series-8-ju8100/ but i really want to get something like a fire stick 4k (Since i already have a few echo dots in the house) because of the remote and convenience. Although how can i hook up the 5.1 speakers to the fire TV stick? Or is there a better option to stream 4k Netflix and what not to my TV while being able to connect my speakers? Any help is appreciated thanks!