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# Calculate Power required to drive

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??

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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.

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