This is the filter changes I did to the Gigaworks DAC to remove the second opamp and to straighten out the filter section of the DAC.

You can see the original values and the values that I changed to in parenthesis. Just tap the signal from the lifted resistors (and maybe add output caps of 4.7uF) The before/after RMAA tests of the modifications can be found here.

Related posts:

1. Testing the Gigaworks DAC with mods
2. And by god, it works…