Tweeters and NS10's
You can do a Search on HOW THINGS WORK...& enter Speakers.

good brief overview.
if using
the NS10M professional studio monitors, the Tweeter is the smaller speaker that you tape toilet paper over.
for a visual of this, you can rent the movie THE MAKING OF PUMP with Aerosmith.
approx 75% thru the movie.
(i'm not sure if it is the Little Mountain Sound Studios or Geffen Records...)
but there they are "in black and white"..nyuk,nyuk.....Nearfields NS10M's with the ETPHFF. (external toilet paper high frequency filter)
these pro's used one square of TP, taped over the tweeter using two pcs of WHITE tape..not sure if single ply or double, but i would bet single ply.
the White tape was used just to color coordinate, and make it look better.
this was first time i've actually noticed this! was watching the VHS movie this weekend.1989....