Also note that the power output is measured at only a single frequency, 1 kHz, instead of across the audible spectrum, 20 Hz to 20 kHz. Measuring power output at a single frequency is another ruse to inflate power output.

As to the "effective power output" it's not a term that was in common usage. It seems to mean, "just crank up the sucker into the region of highly audible distortion, and measure what it puts out."

Our hearing is generally able to detect distortion with musical programming once it reaches the level 1% to 3%.

Alan

Alan Lofft,
Axiom Resident Expert (Retired)