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 m

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".