You are absolutely correct. Also, a 10 db increase is a perceived doubling of loudness.
On the electrical side of things, a 3 db increase is equivalent to double the wattage, a 6 db increase doubles voltage thus power is quadrupled, and a 10 db increase requires about 10 times the wattage. I read, and re-read, a very long explanation to learn this. The electrical values are what confuses people about perceived loudness.
See my post above.
Lets say your theoretical single speaker plays at 1 1/2 db, you add one more but no additional power, you get 3 db more for a total of 4 1/2 db. In order to get 3 db more than the 2 speakers you have now, you have to add 2 more speakers. In order to get 3 more db, you now have to add 4 more speakers for a total of 10 1/2 db from 8 total speakers with the same exact power as you had running 1 speaker.
Instead of doubling Sd or surface area you could double wattage and get the same results.
So for each doubling of Sd you get 3 db, for each doubling of power you get 3 db.
To perceive double the loudness, you'll need a 10 db increase, meaning 10 times the wattage, or 10 times the Sd. That also means that to perceive quadruple the loudness you'll need 100 times the power or Sd.
Of course there are limitations to how practical it is to gain spl. Xmax, electrical power on tap, size of the vehicle, structural integrity, etc.
Thank You ckirocZ28,
Have you seen a semi-trailer backup generator @ a hospital, before ?
One of those, a gravel pit, a circus tent ( or parachute spread out and supported ) .
Might make for a memorable event out in un-inhabitted area { dessert, woods, et cetera }
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