I’m also worried about how much of the harmonics in the music is LOST by the amp?

This subject is basically fantasy football. I was never any good at it. I would always say okay you pick your team players, I pick my stadium, with $3B tax credits, waivers, lease buy-back. The real fantasy is thinking its anything to do with winning games.

With this one the real fantasy is thinking its losing harmonic information. There is some lost, mostly though it is ultra-sonic. Which we already know no one can understand how that matters. So? Get some supertweeters, hear for yourself!

Back to Fantasy Island. The real problem is like Ralph said, harmonics being added. Every component does this. Every single one. Speakers, cables, amps, DACs, interconnects, power cords, floors, racks, walls, on and on. They all vibrate like crazy.

I never really understood just how much this is the case until the last year, as one after another layer of added harmonic resonance was removed and my system became as a result clearer and more natural. The real problem in having a violin, or harmonica, or drum or whatever sound like what it is, it is not the missing harmonics but the ones all these components add.

So when I went to cones a lot of them were gone, but they were mostly shifted to a narrow band- ringing. This imparted a hardness to the sound that in some systems can be mistaken for detail. As things get better and better however it becomes more clear this is not right.

Springs remove the ringing but leave harmonic resonance. Added harmonics. Altered tone. Instruments that no longer sound as they should. Remove these, with just the right amount of damping, wow what a difference! Less harmonics, not more.

Same with speaker cables. Same with interconnects. Amps? Why would amps be any different?

In reality, I mean. In fantasy land anything goes. Fantasy or reality. The choice is yours.

I took down the long answer. This shorter one is better. The amazing thing, what you are looking for that is lost is: music. A little or a lot is lost every inch of the way.

Everything matters. Go and listen. You will see.

The sort of fine detail you are talking about is lost everywhere. From the panel through the power supplies, from the platter to the phono stage, from the amp through the crossovers and internal wires and speaker cabinet and drivers. Every tiny little bit of it. For some reason people want to focus on amp. Or speakers. Or what was the latest one? Oh yeah, stylus. The stylus is the most important. Didn't you know?

Meanwhile, where was it I saw that one guy, everything matters? https://systems.audiogon.com/systems/8367 Right. That's the one. Everything matters. Including, yes, even the amp.   

You can hear it easily. Play your favorite music. Flip off your circuit breakers. Play it again. Hear that? That was just one little bit. Imagine getting rid of that, times 100. https://youtu.be/zZcZ6eJoxeE?t=1