In this particular case we can very easily judge the quality of the microphone, because the guys are talking and their voices sound OK – quite in contrary to the absolutely disgusting sound of the "violin", coming from the "loudspeakers"…
Here is another example of super crappy sound (do not listen to it - it is real punishment!) : http://www.youtube.com/watch?v=R1Segwsslno&feature=related
Wow, I have never heard more colored and resonant midrange!
I see only one problem with all the videos - there is no way to understand how well the drivers are integrated...
"If you can't explain it simply, you don't understand it well enough." -A.E.