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How many times louder is 64.1 dB than 55.2 dB?

post #1 of 15
Thread Starter 
I was wondering what the difference between the volumes (a 6870 and 480 at load) are because the scale is logarithmic and not linear.
Thanks.

Here is the link with the volumes:
http://www.anandtech.com/bench/Product/290?vs=309
post #2 of 15
I believe 64.1dB is 1.161231884057971 times louder than 55.2dB. thumb.gif
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post #3 of 15
Quote:
Originally Posted by Jokah View Post

I believe 64.1dB is 1.161231884057971 times louder than 55.2dB. thumb.gif

He said logarithmic not linear. doh.gif
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post #4 of 15
Quote:
Originally Posted by Jokah View Post

I believe 64.1dB is 1.161231884057971 times louder than 55.2dB. thumb.gif

not really..

On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB.

fo 55 to 64 is quite a bit louder.
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post #5 of 15
Quote:
Originally Posted by Klinkey View Post

He said logarithmic not linear. doh.gif
Quote:
Originally Posted by ikem View Post

not really..
On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB.
fo 55 to 64 is quite a bit louder.

We use a decibel scale for sounds for a reason. Because that's how our ears react to it. The OP did not ask "How many times greater is the power of this sound". I believe they were asking how much louder it would sound to the ear.
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post #6 of 15
noise levels double every 3dB IIRC.So around 3 times louder
    
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post #7 of 15
Thread Starter 
Quote:
Originally Posted by Bitemarks and bloodstains View Post

noise levels double every 3dB IIRC.So around 3 times louder

So the 480 is about 3 times louder than the 6870? Thanks. The 480 is about 30 dollars cheaper than the 570, so I might get the 570.


Thanks everyone.
post #8 of 15
Quote:
Originally Posted by hour1702 View Post

So the 480 is about 3 times louder than the 6870? Thanks. The 480 is about 30 dollars cheaper than the 570, so I might get the 570.
Thanks everyone.

I thought that for every 10dB the sound doubles headscratch.gif

40dB would be twice as loud as 30dB thinking.gif
But, I've been wrong before biggrin.gif
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post #9 of 15
Quote:
Originally Posted by Bitemarks and bloodstains View Post

noise levels double every 3dB IIRC.So around 3 times louder

Bite has it right, doubles for every 3db,We have almost a 9db change so this is roughly 10 times as loud

You can see on this chart the ratio vrs db change

427
Edited by PCCstudent - 4/9/12 at 9:22am
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post #10 of 15
Quote:
Originally Posted by ACHILEE5 View Post

I thought that for every 10dB the sound doubles headscratch.gif

^This... pretty sure.

Perceived loudness doubles every 10 dB; its sound intensity that doubles every 3dB.

So, if we use the 6870 as a baseline, the difference between the 6870 and 480 is 8.9dB (assuming they held all sound equipment, ambient noise levels, fan-speeds and locations constant). So divide by 10 = .89 Then multiply by two. This will yield 1.78. So the 480 is roughly 1.78 times louder at full load (and 100% fanspeed?) than the 6870.

EDIT: Ok yeah, I'll stand by the 10 dB remark solidly.
Quote:
Perception
Sound studies tell us time and again that a 3dBA increase in sound level is barely noticeable to the human ear. In fact, you have to raise a sound level by 5dBA before most listeners report a noticeable or significant change. Further, it takes a 10dBA increase before the average listener hears “double the sound.” That’s a far cry from 3dB.
Source
Edited by Munkypoo7 - 4/9/12 at 9:14am
     
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