Absolutely correct. 100 dB is FIVE times (5x) louder than 85 dB.
I believe it is 32X louder (2^5). 10db is a 10x increase.
Absolutely correct. 100 dB is FIVE times (5x) louder than 85 dB.
Sure you can add them, which then translates to multiplying their corresponding linear values. For example:
log(1000) = 3
log(10000) = 4
log(1000*10000) = 7
log(1000*10000) = log(1000) + log(10000) = 3 + 4 = 7
See?
Quote:
Originally Posted by Dokkalfar
Im not sure exactly how it works (too early for me) but instead of it being 12+20, You would have something like (10^12) + (10^20).
That's only if you wanted to add/subtract the linear values. Hearing protection devices don't subtract a certain amount of noise, they effectively multiply it by a certain fraction, which is the same as subtracting a number in logarithmic form--a "29 dB" earmuff basically subtracts 29 dB from environmental noise (not quite that simple in reality, but that's how the math is supposed to work).
Quote:
Originally Posted by Dokkalfar
This SITE HERE gives you a total dB of 20.6, though I don't know if adding them is the same as adding dB reduction. Sound is really weird. But given a 3dB change is a doubling/cutting in half change, that could be about right.
Theoretically, at the most simplistic level, you should be able to add the noise reduction values, but one of the main problems--among others--is that for each device measured against a human head there is some noise that cannot be reduced, and this is largely because a certain amount of noise is transmitted directly through your skull to your inner ear. For example, true 20 dB earmuffs and true 20 dB foam plugs cannot reduce noise by 40 dB when used together, even though the math would suggest it, because the same noise that leaked in before is going to leak in now regardless (in fact, it might not be physically possible to reduce noise this much without completely enclosing one's head). That's only part of the limitation (I'm no expert on hearing protection), but it's just to give you some idea of how things work.
However, your hearing is logarithmic as well IIRC, so if the power is halved (6dB), it would not actually be a significant drop in perceived noise.
Absolutely correct. 100 dB is FIVE times (5x) louder than 85 dB.
so your saying that double hearing protection is good then.
Huh? What's that, you say?
Does doubling up plugs+muffs have a literal additive effect in noise reduction?
...
Anyone else double up?
I do take plugs, but they get uncomfortable
has anyone tried using two sets of ear plugs rather than ear muffs??? sometimes I forget my ear muffs and only have ear plugs. I wonder if this would work??