RCA outputs to COAX input - is there only a splitter or is a extra device needed


RCA outputs to COAX input - is there only a splitter or is a extra device needed please? My BLUESOUND VAULT only has RCA outputs and if I use it as only a streamer and de ide to get an external DAC such as Musical PARADISE Tube DAC or a Denafrips DAC I will need to connect to COAX. Also these DACs seem hard to find. 
Thank you,
Agentwja 
agentwja

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