How do I get all four output channels digitally?
With miniDSP 2x4, unless 2 x miniDIGI boards are stacked on top of one miniDSP kit, it's not very easy. Easiest is to consider the nanoDIGI in that case which is much easier to implement/use. The nanoDIGI has more than 8ch of digital outputs and will end up being lower cost than trying to build a 2x4 + 2 x miniDIGI.
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