This is to help clarify my train of thought.
I am aware that in order to add 2 dB (not similar) values . i could follow the post in this link.
The formula is
Here is where I am confused. Let's say i want to add dB SPL values, based on the link above, the formula remains the same to add 2 decibel values.
But since the formula to calculate dB SPL (based on pressure) is 20*log10(p1/p0), where p0 is the ref pressure.
In which case, if I am adding 2 dB SPL values, shouldn't the formula be
Why is that not the case ? What am i missing here ?