The article explains how to determine speaker impedance. Not how to
measure amplifier power.

My point was "how do you know" the OP did not use an 8 ohm resistor
for his power measurements. He did not say.

The common notation for power is E squared /R.

E squared /Z will not give you the correct answer unless Z is purely
resistive.

You can not just measure voltage across a complex impedance and
determine power. It is more complicated. You must then also know the
phase angle that the reactance presents along with the resistance.

73
Gary K4FMX


On Wed, 29 Sep 2004 09:19:22 -0700, "Micro MegaWatt"
wrote:

http://www.epanorama.net/documents/a...impedance.html

Should expain it