I still use wh-1000xm2, but it makes a buzz sound when I turn anc on, do you know how to fix it? I’ve literally tried everything on the internet but I still can’t fix it.

Yesterday I ordered a FiiO M11S, around $450, I am still not sure to be honest, I hope I didn’t make a mistake, some users here say a DAP is a waste of money, but other users told me a DAP is better than all android phones and should not listen to them :/

Which headphones has the best audio quality under $350 in your opinion?