I didnt mean to sound like I was picking on you Scott.
There were several posts by several people that were
worded wrong, I chose your posts to respond to although
I meant it for everyone that had the same claim.

I have explained that so many times on RAC in the past
decade I eventually made the tech page to save me from typing it
all over again and again....

Scott Gardner wrote:

Interestingly enough, the post of mine you quoted below was the only
one where I described the phenomenon correctly, attributing the second
3 dB gain to doubling the number of loudspeakers, and not mistakingly
referring to it as "doubling the cone area".

but you must not have read my paper !!

1. Adding one sound to another sound of the same amplitude (volume) will
gain you 3dB.
2. Adding one sound to another sound of the same amplitude and correlated=

will gain you 6dB.
(correlated means exactly the same phase, and likely to occur with the lo=
ng
wavelength of bass notes in our cars)=85

it IS NOT a facto of doubling the speakers OR doubling the power to the
speaker!!

Eddie Runner
http://www.installer.com/tech/conearea.html