For me it’s the opposite. They have a “transparency” feature that works lets through ambient noise.
I often wear one set to transparency when I’m alone and have a podcast going or something. Ideal for something like a grocery store but still leaves me with full awareness. They also detect if I start speaking and automatically pause whatever is playing.
Loud noise suppression works with transparency mode. You might be thinking of the similarly named noise cancellation mode which works opposite to transparency.
Loud noise suppression does a temporary switchover when a loud noise happens to try and protect your hearing.
