Question for you speaker design experts... What are the benefits of adding a second driver of the same size to a speaker? Specifically, consider a small satellite speaker with a 3" mid-bass driver. What would be gained by adding a second 3" driver? (Consider the tweeter as the same in all of the scenarios below.) SURFACE AREA: A single 3" driver has a surface area of Pi x (1.5**2) = 7.07 sq. inches. By adding a second 3" driver, the total area would be 14.14 sq. inches. More surface areas means I can now move more air. So I can play the speaker louder, right? Comparatively, a single 4.25" driver would have a surface area of 14.19 sq. inches -- virtually the same. So with all other design elements being equal, are there any benefits of having two smaller drivers vs. a single larger one? How would their sounds differ? POWER HANDLING: I assume that a second driver would increase the overall power handling capacity of the speaker, right? FREQUENCY RESPONSE: No change here, I think. A second driver of identical specs adds no extension to frequency response, right? WHAT ELSE?: What am I missing? Why else do designers add the second, same-sized driver? THE BOTTOM LINE: Most importantly, what would any/all of the above mean in terms of sound quality? What difference would I hear? Fuller? More dynamic? Thanks!