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Old 4 weeks ago
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Lowest resistor needed to sum to ADC

I am trying to sum 2 stereo signals from two different preamps to a single stereo signal.
L1 + L2 = L
R1 + R2 = R

Signal is going straight to an ADC.
I have a huge amount of gain available from the mic pre's so a small loss isn't an issue, but I want to keep losses at a minimum.
What minimum resistor values do I need?
Would even 100 Ohms be enough?