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It does appear it's done in software, this post is talking about the Free reimplementation: https://github.com/chadmed/speakersafetyd/blob/main/src/type...
(Nobody does maths with opamps any more, it's less area and lower power to ADC the signals you want and do it in digital. It's also much easier to tune)
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> Doesn't have an app
It does have an app. See https://joinmastodon.org/apps for not only the official app, but also literally dozens of third-party apps.
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The gist of it is, you need a calibrated microphone like the uMik from MiniDSP or one from Dayton Audio. That's about $100, though, so that sort of kills the value equation in a lot of situations.[1]
You then measure the speaker's output with something such as a free tool called Room EQ Wizard: https://www.roomeqwizard.com/
REQ can then output the necessary DSP configuration files, that can be then be used by a MiniDSP, EqualizerAPO, etc. Or it can just tell you the necessary corrections that can then be manually typed into anything that supports parametric EQ settings.
Here's a video demonstrating all of that: https://www.youtube.com/watch?v=T1aYsjPc2m4&t=2s
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[1] However, there are community efforts to take these kinds of measurements and open source them so everybody can benefit. The largest I'm aware of is these open-sourced headphone measurements (which require a different sort of measurement rig) and corrections: https://github.com/jaakkopasanen/AutoEq/tree/master/results/...
For speakers, there are the measurements and EQ corrections published by places like AudioScienceReview.com and NoAudiophile.com
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