Assuming that the Samsung app goes by what the study actually used, those “75-85 dB” are a bit misleading. The study specifies that it’s 80-85 dB SPL with zero weighting, which at 100 Hz translates to 61-66 dB(A) with the more familiar A-weighting used in most noise meters and in noise exposure limits.
April's fool day...good one!
This sound like those videos that go "888Hz heal your body sound" on YouTube.
Yes it's fyn