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Difference of STC

Teach you to better understand the difference between different soundproof decibel data.

♥25dB  Normal speech can be easil understood
♥30dB  Normal sceech is audible but cannot be understood
♥35dB  Loud speech can be understood
♥40dB  Loud speech is audible. but unintelligible.
♥45dB  Loud speech is barely audible
♥50dB  Shouting is barely audible
♥55dB  Shouting is inaudible



Difference of STC

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