Decibel

Question 1

What is the 3db rule

Answer 1

Generally when adding 2x the power you gain 3db and the same when you minus. So if I have speaker playing at 100db and add another 100db you will have 103db

Question 2

How does adding decibels work?

Answer 2

Since the decibel is a logarithmic scale, the laws of addition apply to any summation of sound pressure level.

Question 3

What is sound power level?

Answer 3

(Lw) in dB is related to intensity of a sound through a unit surface area. This is independent of distance to the sound source.

No matter where you stand the Lw stays the same.

Question 4

What is sound pressure level?

Answer 4

(Lp) is a measurement of intensity that is dependant of distance from the source, location and environment. E.g temp / humidity.

Question 5

Can you calculate spl in theory?

Answer 5

Yes. If you know the sound power level. You can calculate the sound pressure level at a given location.