Twice the sound level is +6dBA right?

[BFNY]

From Bruel and Kjaer book "Architectural Acoustics" pg. 16-17

Definitions of acoustic Energy Density, Intensity, and Intensity Level

[BFNY]

From Bruel and Kjaer book "Architectural Acoustics" pg. 18-19

1.16. Sound Pressure Level
1.17. Sound Power Level

In case anyone is still confused about the difference

[sreten]

Originally Posted by SoNic_real_one

And to produce those 3dB in power we need 3dB in voltage.

Hi, And another person who simply does not understand the concepts, the above is simply not true, rgds, sreten.

3dB in power always implies 1.5 dB (x1.4) in voltage ratio, whether it is actually true or not, for the actual case.

[sreten]

Originally Posted by BFNY

From Bruel and Kjaer book "Architectural Acoustics" pg. 18-19

1.16. Sound Pressure Level
1.17. Sound Power Level

In case anyone is still confused about the difference

hi, fairly cluelessly you can't work out they are exactly the same thing, rgds, sreten.

[sreten]

Originally Posted by BFNY

From Bruel and Kjaer book "Architectural Acoustics" pg. 18-19

1.16. Sound Pressure Level
1.17. Sound Power Level

In case anyone is still confused about the difference

Hi,

Fairly cluelessly you can't work out they are exactly the same
thing, as it seems so the fairly clueless original author cannot,
or if he does know he pedantically neglects to say so, pathetic.

rgds, sreten.

[BFNY]

From Bruel and Kjaer book "Acoustic Noise Measurements" pg. 32-33

More on SPL, SWL, and Decibels

[BFNY]

From Bruel and Kjaer book "Acoustic Noise Measurements" pg. 34-35

Math behind the following topics -

Theory on adding 2 equal sources - independent and uncorrelated page 34,

Theory on adding 2 equal sources - Correlated, conclusion on bottom of page 35

[BFNY]

Originally Posted by sreten

Hi,

Fairly cluelessly you can't work out they are exactly the same
thing, as it seems so the fairly clueless original author cannot,
or if he does know he pedantically neglects to say so, pathetic.

rgds, sreten.

So...I'm clueless, the Bruel and Kjaer author is clueless, and you are right?


Sreten - You continue to confuse the definition of *acoustic intensity*, the power passing through a unit area in space, which IS proportional to the square of the sound pressure in the far field, with the definition of *sound power*.

Also, there's no reason to ever convert "back to power" when dealing with voltage or pressure dB's. No one ever does this. Practically everyone figures out if the dB units are power or not, and then uses 10log or 20log as appropriate. In the real world, that is.

I suggest people read the Bruel and Kjaer reference material for a good understanding of the subject.
Bob

[Cal Weldon]

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