A utility that allows you to convert FFT measurements from MobileTools into a format that AutoEQ understands. It is worth calibrating the speakers to get a smooth amplitude-frequency response.

npx mobiletools2autoeq input.txt output.csv

I suggest using a combination of the following:

1. MobileTools — iOS app that uses calibrated microphone profiles to record FFT.
2. mobiletools2autoeq — This utility that converts measurements from MobileTools format into a format that AutoEQ understands.
3. AutoEQ — An amazing app that creates a correction file based on the measurement and target curve.

To generate a correction in AutoEQ, execute:

python3 autoeq.py
  --input_dir=input \
  --compensation=compensation/zero.csv \
  --output_dir=output \
  --equalize \
  --parametric_eq

You can then use the resulting file located in the output/* ParametricEQ.txt folder in any supported application or plug-in. I use SoundSource on macOS.