Decibels are not quantities of anything, not even sound.They are the ratio between 2 different levels of power.Bels(in this case) are the relationship between amplitude and energy, decibels are 1/10th of a Bel.Bels are logarithmic, and its complicated even further by the fact human hearing is logarithmic as well.

3 dB = double the intensity
10 dB = ten times the intensity, but twice the perceived sound level

In terms of amps and speakers:
2X the amplified power = 3 dB
2X the speakers = 6 dB
2X the perceived loudness = 10 dB

Engines:
2X the horsepower = 3 dB
4X the engines = 6 dB
10x the horsepower = 10 dB

difference between 100 dB and 200 dB = 10x10x10x10x10x10x10x10x10x10 or 10 billion times the intensity=2x2x2x2x2x2x2x2x2x2 or 1024 times the perceived loudness

anyone have a spare brain?

ya I'm lost also

You really don't need to understand it.If you ever needed to figure out dB(I don't know why you would), just get a calculator that has a Log(arithm) function.The log of 2(2X power) is .301, which is in Bels, so in dB it's 3.01(commonly refered to as 3 dB).Log of 3 is .477 or 4.77 dB.Log of 4 is .602 or 6.02 dB.Log of 10 is 1 or 10 dB.

In terms of human sound perception, it takes 10 times the sound output, for us to perceive it as a 2X increase.

I remember just a bit of this shit from my loud stereo days 10 years ago.

how is the standalone coming?
LOL!

Thanks for clrearing that up, Eric.

It appears we've weeded out the intellectuals from the dumbasses. ;)

speak for yourself Mat!

i am still not weeded out!

-E

At least you got the title of the thread correct ;)

Yep, I admit it, I'm a nerd.But it's OK, because the chicks still dig me

:ohmy: you have way to much time on your hands! ;)

I wish that was the case.

LMFAO I wish i did 2!!!

I wish that was the case. [/b][/quote]
You would if you weren't always sleeping or "napping" :slap:

We use dB reading everyday when reading the power out of our transmitter on our radar. I don't go as far as breaking it down to all that shit cuz that's a little past me. All I know is that if we up the dB by 3 we double our power output. I don't know insane specifics. Guess that's why I'm a tech and not an engineer.

Hey there Mensa how do you ever learn this shit, if your sleeping 98% of the day?

<!--QuoteBegin-Enes@Aug 18 2004, 11:56 AM
anyone have a spare brain?[/quote]
That comment weeded yourself out. :lol:

The past couple weeks my cable modem was randomly losing connection. A tech came out, changed a cable and a splitter, and the signal went from -15db to -9db, a gain of 6. My connection has never been better.

you are correct except for this. this is a subjective statement. what one person describes as twice as loud might not be twice as loud to another person.


anyway, in the other thread, i might not have said it right, but what i meant with 6 db was pressure. double the power is +3db, double the pressure is +6db. sorry.

ya that 6dB gain shoulda quadrupalled the power of whatever signal was coming through there. Prolly why you gotta super connection now!! Our radars output is at about 46dB