16? I suppose that some of his behavior could be written off to that, if not all of it. I would not expect someone 16 years of age to appreciate that sort of equipment. He's probably got the tone controls all cranked to the maximum, and is only looking for the loudest system he can put together, independent of sound quality. He only wants it to shake the room. He only understands loud.
I watched the first video, but have a hard time understanding the concept behind the 'see what my system will do' videos. If one's only measure of quality is speaker excursion, well, that says quite a bit in and of itself.
Someday, in probably not the too terribly distant future a pair of abused Polks will pop up on that auction site or on CL, or perhaps on a curb somewhere.
John