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For the earlier systems with the bass boosts, are the graphs showing what comes out of the cables or what comes out of the speakers?

I would assume they don't care about the very low bass because they were designed as a unit and physically couldn't produce those notes very well anyway. Hence the need to boost slightly higher frequencies to fake bass.

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The straighter lines are what comes out of cables.

The more squiggly ones later (eg: 2:45) are what comes out of a speaker. But since he uses a microphone to measure the speakers, so that measurement will also come with room sound. He would need an anechoic chamber to measure "only the speaker".

He also needs to calibrate the microphone, because like speaker, it does not have flat response.

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