What if I replace it with a speaker from a 396xt or 436 would that sound better? I don't care about waterproofingThe speaker itself is waterproof. It has a polymer diaphragm. It's mot as flexible as non-waterproof, and that's why it sounds tinny. Ripping out the thin felt dust screen material will not help.
If the clips don't line up it's easy to solder fine wires from speaker to board and if nothing matches to hold it in place gluing or hot glue would work. I would try it but I would like to know if anyone did this and can say whether it's worth the effort.I'm not sure they are the same size, and the clips on the speaker that contact the motherboard would need to be oriented correctly.