Are we definitely talking about the same thing? The ones I'm talking about have some kind of pressure sensitive device that closes for a loud noise but stays open for normal sounds. They're not perfect but you can still hear a pheasant's wingbeats when it flushes up, or a rabbit bolting through the wood. 100 times better than the type I used to have for motorcycling which made you feel like you were trapped inside your own head.
No..... I don’t think what you describe is truly passive
I have emtec ones and ok few ears old now so maybe what you describe is modern version I don’t know ...
Ones I have, have a filter in them that is for around the frequency of speech to allow you to hear talking but everything else is muffled or silenced
Paul
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