Ever bothered to look at the efficiency or sensativity ratings of the driver? Most tend to be in the range of 80-95db @ 1w. Some can be as high as 110db @ 1w.

Comparing a jackhammer (you mean the 22/24, right?) and a tweeter just isnt a valid argument at all given that they are meant for completely different frequency ranges.

Again, given a proper build method, you do not "need" more power for a larger driver.