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If you want to calculate stuff, there are several good geometry calculators
on-line. Here's
one that will do the surface area and volume of cones - and so much more!
Just for fun, I calculated the surface area for some speakers (these do not
account for the
domes). These are, of course, only approximations due to variations in depth
from one
speaker model to another).
10" = 163 sq @ 2" depth.
12" = 244.sq. @ 3" depth.
15" = 382. sq @ 4.5" depth.
