Little more in depth here...
My test: Pure Audio PA-3000.1D (quick and dirty) - Car Audio Classifieds
As with any scar tissue, it's very tough. Most times, scar tissue gets massaged in physical therapy so this doesn't happen. Well... how the crap are you going to massage scar tissue on eardrums?
That's right... BASS!!! After he got into (or back into) car audio, the bass massaged the scar tissue on his eardrums and he picked up +10db hearing! How awesome is that!? He said his doctor didn't even believe him.