I searched and could not find the answer in the forums. I know one is 130 dB so adding another would give 133 dB and adding two more would give you a max dB rating of 139?? Seem too high...
theoretically, yes 139, but who really cares. You either have enough output for your needs or you don't. Manufacturers, including Bose don't generally publish the exact conditions of how they were measured, so it's only used a general idea. Don't look too into it....
May 11, 2020
The numbers are theoretical. Ask an acoustician if the numbers are an accurate predictor of performance and they will probably say, "it depends."
Note: Some algorithms predicting increases in dB rely on all the drivers being in a sphere that is within one-quarter wavelength of each other. You're probably okay with two F1 Subwoofers side-by-side, but when you get to four, the drivers are no longer within one-quarter wavelength. The outcome is more complex.
Check out this article.
If you could come up with a number, how would you use it?
Aug 1, 2006
Generally 6 dB per doubling (3dB from the matching additional source, 3dB when the sources are coupled a.k.a. nearly phase coherent).
1x F1 Sub - 130dB Peak
2x F1 Sub Coupled - 136 dB Theoretical Peak
4x F1 Sub Coupled - 142 dB Theoretical Peak