Originally Posted by OpeeFaSho
Two 15's will be louder than Four 10's.

Originally Posted by RAM
I disagree, and the 4 10s will give you a nice crisp pop

ok, theres no way tell which will be louder cause there are to many variables. (sub,power,vehicle, position, etc etc)
but can 4 10s be louder? sure, can 2 15s be louder? sure, and can you get an 8" sub and blow them all away? sure
if you know what your doing
Originally Posted by OpeeFaSho
Any subwoofer will give you that nice clean, snap, crackle, pop sound. It's all in the install and box.
How to calculate cone area
Cone area = pi x (r x r)
pi = 3.14 r = radius of sub
Four 10" = 314.16
Two 15" = 353.43
Clearly show's that Two 15's have more cone area than Four 10's. Having a lot of subwoofer may be an impressive sight to look at.

yes this is true (if measuring the other diameter of the woofer) but not accurate when using it for actual cone area of a subwoofer . this is 1 example where the thiele parameters come into play. the sd tells you the actual cone area.