DACs, RFI and grounding

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I have a Bluesound Vault (gen 1). I only need the streaming side of it so have taken out the PCB fitted it into a smaller box. Is there anything I need to be careful of in terms of grounding and RFI? I'll be using the TOSLINK output to bypass the onboard DAC so I'm thinking it's just the 1s and 0s from the network that need to make it out intact.
Thanks
 
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