I just realized it is possible to reduce output voltage swing without affecting V_bias by changing the value of the 47kohm resistor. This makes experimenting much easier. So V_bias is kept at 3.85V in my case / R17 still 390R Trying a few values of R10 / R11, looks like 0.02% THD is indeed around what this thing is capable of, before the disadvantages of low voltage swing become apparent. A good range for the I/V is around 50 to 200 ohms. I would keep to the higher half of the range; 170R would give 0.5Vrms output voltage. Ignore the crosstalk, an unfortunate side effect from the test set-up. Soldered replacement for R10/R11 would avoid that. Of course, best way to minimize voltage swing seen by the DAC IC while having higher voltage swing at the RCA is still to use active I/V. Also I just realized, the answer for the best value for V_bias has always been there: 2.063V, because that is the value on the V_ref pin and hence would also be the value on the output pin when active I/V is used. Since I_bias gain is calculated to be roughly ~1x, means the best value of R17 should be equal to R10/R11. So, 150ohm or 175ohm for everything is about as good as it gets.