I'll stand by my original comment, I don't find anything of value in this video-I don't think I'm alone in that conclusion. If that makes me stupid so be it. I'll also say that the concept of acoustics is well known, I suspect, to those who frequent this forum, even if we don't post about it over and over. As I also said, if the OP learned something from this video, good for him, I'm sure this YouTuber has other material he might find beneficial. I was unimpressed-I thought I might be entitled to that opinion and I thought posting the video might be an invitation to comment-obviously that was an incorrect assumption.
I'll take some responsibility for this little detour. I should have known better than to engage. As @abnerjack pointed out, in a very kind way, these interactions end up with this sort of pointless name calling with unusual frequency. Should have just ignored the post.

