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Can someone explain decibels to me...

B

BigToque

Lifer
I've got a basic understanding of them, but not a great understanding.

On my amplifier, I can select volumes of -99dB to -10dB.

Why are they negative values? and why is it -99 to -10?
 
0 dB is considered, in audio terms, a 'reference' value to be calibrated against. 0 dB = 1. -10 dB is 10% of reference, -20 dB is 1% of reference, etc. etc. Each 10 dB represents an order of magnitude since dB is logarithmic.

However, this will deceive your ear - dB values are logarithmic, but so is your ear's response to audio, if that makes sense. Something that is 0 dB (reference) will not sound 1000 times louder than something at -30 dB.


 
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