I was wondering the same thing when i sew it, till i realized why they did it.
think about it: they installed it in hope that truckers will start listening to music rather then singing in the shower.
saves a lot on light bulb replacement...
LOL!! I listen to music on my phone in there. NO ONE wants to hear me sing in there, for sure. Of course, they don't want to hear some of my music either. Waylon to the Gorillaz.