USB or S/PDIF for Simaudio 100D


Wondering whether to use USB cable or S/PDIF converter, to connect new iMac to Simaudio 100D DAC, then to Onkyo A-9555 and ERA 4 speakers, maybe ERA 8 sub. I already have a few good digital RCA cables, so cost of converter or USB cable will be close. Thanks.
jl35

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