120W of heat!? Then you are making a class-A home heater, not a modern audio amplifier that has a small class-AB idle current and lots of negative feedback for extremely low distortion. The negative feedback and wide bandwidth does the error correction like most modern hifi amps.
Alan, you mentioned crossover distortion at 20kHz. Can you hear high frequency harmonics of 20kHz? I bet you cannot hear 60kHz and higher harmonics of 20kHz.
Can you hear 0.1% distortion of medium frequencies even if the fundamental frequency is blasting loud? 0.1% is -60dB. Doesn't the fundamental frequency cover up the harmonics?
You mentioned that crossover distortion affects the program the most when the signal is low. But that is when a class-AB operates in class-A with no crossover distortion. The negative feedback is very low in a class-AB amplifier and at low levels you can't hear it anyway because it is less that the sensitivity of your hearing.
You are paranoid about crossover distortion that cannot be heard and can barely be measured, and "high end" that sounds the same as much less costly amplifiers but looking pretty with most spec's that are barely measureable.
Amplifiers sound the same unless they are old or defective. Speakers sound different but EQ can be added to make them sound almost the same.
Many audiophools have more money than audiophiles.
I bought inductors for the crossover networks of some speakers I put together from a local high end speaker manufacturer. They were the wrong inductance so I took an audio spectrum analyser to the manufacturer and showed them that their high end speakers used those wrong inductors and had the frequency response screwed up. They were not upset about their mistake, they only care if a speaker does not look perfect when it has a scratch on it.
My son has a high end car. He "brags" about its power by burning out the tires whenever he accelerates it. Most of the Chinese kids at the local university drive VERY expensive high end cars.
Nothing to do with it's better, it has everything to do with the status. It's purely the name and I am willing to pay for it.
That tells us all we need to know.
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