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Hi, I've been researching on those plugs for months. I have a "one size fits all" plug with filter for some time now (Pluggerz Hobby), but even with the filter the high end cut sucks. I can get Elacin/Etymotic/Westone type plugs here in Brazil (those all use the same filters). Guess I'll stick...

There is a natural limit: http://www.hearforever.org/blogs/01/24/2011/qa-why-arent-there-any-nrr-40-earplugs