Paid gig.. (hi/lo pass filters for audio) (fine tuning quality help)

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it was in first post, 3rd pic.

schematic of the DAC/AMP/filter stuff:

2304×501 138 KB

lots of good background info there as well.. to see what has been used before..etc

to be clear.. it works. But it can sound better. There is where the project requirements com into play. I have it working.. and it sounds OK.. but can sound better. I dont want to GUESS at the values. (need someone with more experience)

thanks.