High Efficiency Speaker Asylum

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This was the setup

Posted by pix on March 4, 2017 at 07:51:46:
I simply used a free generator app i my iPhone as a source, using my 300B tube amp driving.
Ur and Uz is multimeters reading AC (rms) voltage
R is a 10,1 Ohm (low inductance) resistor

A second resistor of 10,1 Ohms where used as Z giving a deviation curve used for calibration.