Negative decibel sound

When I was researching Active Noise Reduction technology that comes as one of the features of Starck designed Parrot Zik headphones, I have learned about sound which has a negative decibel parameters – dB. Theoretically we should not hear it, however some of us do. The negative decibels are one of the qualities of WiFi i.e.  20MHz -72dB the frequency as well as signal strength varies, however it’s always in -dB range with frequency of…

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