Are you familiar with Sonic II earplugs? I have used these for many years at rock concerts, but do not know if they are still being made. They are the only earplug I know that stay in place, protect the ear from ringing after a LOUD concert, yet provide a non-muffled sound. 15 years ago they were available from most sporting goods shops at $12 the pair. They were primarily designed for ear protection during shooting of guns, but still allow conversation between gun shots.
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