Although not a FFT based measurement system it may be something to try with all the Covid down time. It does have a place to enter a Target Curve as well which could come in handy for near field speaker measurements.
https://dev-core.org/ms-docs/auto-e...7U8eSqWQAxUsljrD8wsuRE5WUquFWDVg#requirements
https://dev-core.org/ms-docs/auto-e...7U8eSqWQAxUsljrD8wsuRE5WUquFWDVg#requirements