[Whitebread]

I have a question regarding a AC current and a load with an impedance that varies with respect to frequency (like a loudspeaker).

As the frequency of the input signal changes, does the true RMS power being fed across the load change?

 

[amb]

Yes, it does. P = V² / R, so for an amplifier with flat frequency response (i.e., equal voltage amplitude output regardless of frequency, at least in the audio band and beyond), V is constant, and if R varies, then the power varies accordingly.

 

[Whitebread]

Alright, thank you.