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Technical question about output power of an amp

post #1 of 4
Thread Starter 

If an amp's spec says it has a maximum of 5W power at 32 Ohms , how can we figure out the maximum output power at a different impedance  say, at 600 ohm ?

 

I am guessing it cannot be determined ?

post #2 of 4
Thread Starter 

do I have to look at the amp's maximum voltage output ?

 

Guess I figured it out.... I use the max output voltage then choose my impedance find I using the Ohm's law then P=I*V

 

 

Am I correct ?


Edited by Sam21 - 6/23/14 at 5:42pm
post #3 of 4

A very rough approximation would be:

 

     P2 = P1 * R1 / R2

 

In your example that gives 0.27W @ 600 Ohm.

post #4 of 4
Quote:
Originally Posted by Sam21 View Post

If an amp's spec says it has a maximum of 5W power at 32 Ohms , how can we figure out the maximum output power at a different impedance  say, at 600 ohm ?

I am guessing it cannot be determined ?

You can't do that reliably. Some amps are better at low impedance output. Some at higher impedance.
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