Donating the ears will do nothing for research. What goes on on the inside of the ear drum is where it's at. What they need to be looking at is auditory cortex, the part of the brain that processes auditory information. I don't know what they can lear from a dead brain. There's a misfiring that I don't think will be detectable after death.
This is one of many many reasons why research is slow and treatment mostly non existent.