[maiden7705]

I know this is embarrassing to ask and though my graduation major is in computer science and asymmetric algorithms, I should not be forgetting basic physics, but here it is:
 
How can we get the power required to drive the phones to a standard "loud" level, like 105 Db, given the sensitivity and impedance
 
So for e.g.
@  32 Ohms, 
if                          87 Db     => 1  mW (rated sensitivity of the phones)
then to drive to  105 Db  => ?? mW
 
My rudimentary Physics is not helping me
 

 
 
To make things interesting:
If suppose my  E12 can drive >880mW@32Ω
How Much power would it be able to deliver to a 600 Ohms Tesla T1??

 

[Radio_head]

This link should clear everything up.  And if you're too lazy to do the math, they even have a handy downloadable calculator that can do it for you.