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decibel level of human hearing(human-auditory-range)

Decibel level listed of solfege.

| Do | Re | Mi| Fa | So | La | Ti | Do 
|- | - | - |- |- |- |- |- |
| 24 | 27 | 30 | 32 | 36 | 40 | 45 | 80

![noise intensity](http://www.cochlea.org/var/plain_site/storage/images/media/images/jauge_simpl_en/17752-1-eng-GB/jauge_simpl_en.png)

I saw that whispering decibel level is around 40. And, normal voice level is around 60. And, Human can hear 0 - (120-130). So, my question is, "Do people practice solfege like whispering?"

I had downloaded [the extension](https://chrome.google.com/webstore/detail/sound-meter-noise-decibel/fhamlklnpkhdfepaipljcngncafnlbfa/related). The meter always stays around 50-80(When I can't hear any sound also). So, does it mean the `Sound Meter extension` is showing wrong decibel?