OK upon closer inspection,(unless there are opamp's on the bottom side the PC board) it appears the outputs are driven direct from the 1701 through a passive filter no?
On the miniDSP 2x4 unbalanced the output is driven directly by the 1701. The balanced 2x4 board uses opamps for the unbalanced to balanced conversion, though I don't know what type. Likely its the same used on the 2x8 board: NJM 2068.
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