I use AutoEQ (https://github.com/jaakkopasanen/AutoEq https://github.com/jaakkopasanen/AutoEq) for my headphones. It works by "parsing frequency response measur

I use AutoEQ (https://github.com/jaakkopasanen/AutoEq https://github.com/jaakkopasanen/AutoEq) for my headphones. It works by "parsing frequency response measurements and producing equalization settings which correct the headphone to a neutral sound". They also have a huge database of already measured and equalized data, which is what I use.