giuliomoro Power the speakers from a separate USB power supply
confirm that you cannot see/hear the noise from the audio inputs
First of all, thanks a ton! I've actually managed to get a lot done, and you've helped the most!
Results!
https://i.imgur.com/x9XzblZ.png (without sound cancelling)
https://i.imgur.com/YLWja9R.png (with sound cancelling)
I can see why headphones are the ideal scenario for destructive interference -that echo is so annoying 😃!
(the objective is to use destructive interference to nullify the red signal by using the green signal, which does work at lower frequencies!)
Now for the question, in case you missed them!
Can you explain to me what the issue was?
All of my problems have been fixed! I'd just like to have more insight into the circuits and hardware 🙂