January 17, 2012 1:11:38 AM PST
6 inch surface area is 28.26. 12 surface area is 113.04 or 4 times the surface area. Right off the bat you're down 6dB. So all thanks held constant, you need to run 4 times the power to a given 6" sub to make up for the difference in surface area. I'm going to say its highly unlikely that you can make a 6" sub musically as loud as a 12, for it to happen you would need the " perfect storm" of variables to occur. I'm talking a drastically underpowered 12, a beefier than hell 6 that's very over powered, a perfect box for the 6, a horrible box for the 12, and a whole lot of luck.