Absolutely. But even the flattest earplugs aren't flat because not all the sound goes through the canal they plug up. Bass conducts through your whole body so y

Absolutely. But even the flattest earplugs aren't flat because not all the sound goes through the canal they plug up. Bass conducts through your whole body so you end up with 110dB of bass, 90dB mids/highs, 70dB noise. The unattenuated bass isn't damaging your ears, but it makes a non-flat experience. This is why I recommended some -12dB earplugs in another comment.