As I have already stated above you must have missed what I was referring to. Which is Exponential Growth of Power, as it takes TWICE as much POWER to have +3dB gain.
Use reading comprehension to try and understand the point I was making as you too are trying to manipulate the manner and meaning of what I intended to convey to the reader. I thought that this was clear but apparently some need help in understanding my meaning.
Why would I say that adding another speaker would Double the output...It will only add +3dB.
But nice graph i'm glad you used this although it is pointless because it takes about 10 Times as much POWER to Double sound.
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Source:
http://www.globalrph.com/master_speaker.htm 
