Thanks for contributing to the thread. I don't understand what you say you are seeing, however. What do you mean when you write we should "see something different at about 130 hz? I wasted the speaker test video but have no idea what I should be seeing at all... at 130 hz or at any other frequency. All I see are squiggly sign waves but without technical training, I have absolutely no idea what the sound waves mean.
Can you please explain?