I listened to 5 x 7's , 6's, and 6.5's and the 5 x 7's deifinitely kicked out more bass. So why do so many of you say they don't ??
5x7 = Pi(2.5)(3.5) = 27.475 Cone Area
6" = Pi(3)^2 = 28.26 Cone Area
Because people have hard on's for cone area around here.
But, like EVERYTHING, it depends on the application, installation, quality of the driver, design of the driver, amount of power it's seeing, etc.
I've seen some 3" drivers that have midbass that drops my jaw, and I've seen 6.5"s that make my farts sound like an Opera.
But as previous posts have stated, there are a lot more options when going with the regular 6.5" drivers... there are hundreds of component sets to pick from in the 6.5" range... however there are very few (that I've seen) that are oval... in fact, I've only seen Coaxial ovals... but I never looked for oval comps.