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Nice writeup, Bob, and it raises another question about 125% modulation. A calculation shows a 2 dB increase in peak power (which I assume is a measure of loudness in AM since the demodulated audio would also be up 2 dB) over that of 100%. It is usually agreed that a 1 dB increase is the minimum which a human perceives as “louder” and 10 dB is perceived as twice as loud.
From this link : http://www.sengpielaudio.com/calculator-levelchange.htm the closest tabulated dB value in the “loudness” chart is 3 dB which is perceived as 1.23 times as loud. This would suggest that a 2 dB increase would be less than this loudness increase.
So, the question is “Is asymmetrical modulation worth while?” Have you have ever done a side by side comparison and, if so, what did you think?