I noticed that sound from my FW13 can get absorbed by blankets or my pants when I’m using it as an actual laptop. So I made these little sound redirectors. They have two holes for magnets, but they are not necessarily needed. I also got a print to work with press fit alone, but I recommend the magnets for the satisfying snap.
I actually don’t know how well they work, I go mostly by feel and the difference isn’t big, although it definitely is there. The audio isn’t necessarily better, but it is louder.