Oops. My mistake. I thought you made the video and hence I was asking. I have a bad habit of glancing at posts and reading it very fast. So I missed out the part where you say "you were watching this youtube video"I am not sure if video itself has been doctored , by changing any of the parameters except power supply. I am assuming not
So someone else has made the video and hence we cannot know how it was made. I don't think it is doctored. My guess is that the two videos were made at different times and the position of the recording microphones were not at the exact same position.
I was absolutely intrigued by the difference because I have done these tests and I find no difference that my ears can make out.