[FourT6and2]

If the only output power on an amp is listed at 480mW @ 600 ohms, is there a way to calculate the power at other loads? Is it linear? For example would it be 960mW @ 300 ohms? 2.8W @ 100 ohms, etc.?

 

[mattiav]

I believe it depends on the amp design.

 

[tomb]

If the only output power on an amp is listed at 480mW @ 600 ohms, is there a way to calculate the power at other loads? Is it linear? For example would it be 960mW @ 300 ohms? 2.8W @ 100 ohms, etc.?

Mattiav is correct. There is no way to tell unless you know the design of the amplifier. Even then, a measurement at the different impedances is the only sure way to tell.

An amplifier with a high output impedance, if measured at 480mW @ 600 ohms, might measure 120mW at 32 ohms. Conversely, a solid state amplifier with a low output impedance might measure 1.92W at 32 ohms. Even if you know whether the amplifier is solid-state or tube, low output impedance or high output impedance, a measurement is the only certain method.