The free-floating tweeter is outside the speaker box, meaning sound radiates in all directions to give a deeper, wider soundimpression, similar to the tones you would hear during a live performance or in a recording studio.
The 'Dean scream' dirty trick which, as you know, was created by filtering out the deafening crowd's roar to create the false impression of a maniacal yell (a sound clip used to this day during the Political Junkie segment on NPR's Talk of the Nation).
It is also possible that the market commentators wanted to make a good impression on listeners and so said things that the commentators believed would sound sensible.